Butterfly Gardening
        Outsidepride’s Top 10 Nectar Flowers for Butterflies
        By Kimberly Bell
        Cover design by Kimberly Bell.
        ©2013 by Outsidepride.com, Inc.
        
        
            All rights reserved. No part of this manual may be reproduced without written permission
            from the publisher.  The information in this manual is true and complete to the best of our
            knowledge. All recommendations are made without guarantee on the part of the author or
            Outsidepride.com.  The author and publisher disclaim any liability in connection with
            the use of this information. For additional information, please contact Outsidepride.com,
            Inc., 915 N Main, Independence, OR 97351
        
     
    
    
        
        
        Not many people would consider themselves to  be fans of insects. In fact, many of us are absolutely scared of them. There  is, however, one beautiful insect that does not bring out the creepy-crawly  feeling … the butterfly. Butterflies are colorful and graceful. We delight in  their presence and look for ways to encourage their fluttering through our  gardens. In recent years, more and more gardeners are gaining the skills to  grow a garden that is butterfly friendly. We enjoy their fluttering beauty, but  we also know that butterflies are pollinators and are important to our  ecosystem.
        
        Butterflies have fascinated mankind throughout the  centuries. The ancient Egyptians believed that butterflies were symbols of the  human soul. Native Americans believed that butterflies were messengers of the  Great Spirit, and if you whispered to a butterfly, your wish would come true.  Even today, tourists seek out the Trans-Mexican Volcanic Belt to see the masses  of monarch butterflies that overwinter there. There is something nearly magical  about an abundance of butterflies flittering around, and people of all ages enjoy  watching them. 
        
        Lepidoptera is the insect order to which butterflies belong,  as well as moths and skippers. When starting out with plans for attracting  butterflies to your garden, it’s good to know what species are present in your  area and their preferred habitats. Each species has their own preference for a  habitat. Determine what plants are preferred and what will do well in your  specific climate, and begin to add plants to your landscape to support the  butterfly species in your area. As with acquiring any new bit of knowledge,  resources are invaluable. Have an identification field guide so that you can  begin to identify the butterflies that begin to visit your garden.
        
        To invite butterflies to your garden, you will need to  understand their life cycle. The four stages of their life cycle are: egg,  caterpillar, chrysalis, and adult. To have the greatest success creating a  butterfly friendly garden you can accommodate the needs of each of the four  stages.
        
            - Egg – the female butterfly lays her eggs on host  plants. A host plant is one that will provide food for the caterpillars which  hatch from the eggs.
 
            - Larva or also called caterpillar – they have  mouth parts that are designed to chew, and they have voracious appetites. Their  job is simply to eat and grow.
 
            - Pupa or also called chrysalis – the caterpillar  matures, finds a place to hide and spins silk to attach its hind legs to a firm  support. It sheds its caterpillar skin and turns into a chrysalis and rests  hanging from its support (eaves of buildings, underside of leaves, along the  stem of a plant, etc).
 
            - Adult – finally the adult butterfly emerges from  the chrysalis. It has a proboscis, which is a straw-like mouth part, and  depending on the species, it eats on flower nectar, tree sap, rotting fruit  and/or dung, and they drink water from puddles. 
 
        
        
        If you are eager to have butterflies gracing your landscapes  and gardens, there are a few specific elements that are needed in each  butterfly habitat: a sunny location with shelter, food, and water all in close  proximity to one another. It’s also very important to have a pesticide free  garden!
        
        Location: The site for the butterfly garden needs to be in  full sun, have protection from wind, and be free from all pesticides. Insects  are cold-blooded, so their body temperature is dependent upon the environmental  temperature, and they need to be warmed in order to fly. Add to the warmth of  the garden by putting in a gravel path, stepping stones or large rocks as the  butterflies will bask in the areas of radiant heat.
        
        Butterflies’ wings are extremely fragile, so protection from  wind is important. Plant a hedge, blooming shrubs or evergreens in the garden  to provide shelter. They will find protection from the wind and rain in these  areas, as well as hide there on cloudy days and at night. In addition to shrubs  and evergreens, solid structures like gazebos, arbors and fences provide  shelter and a place for the chrysalis to attach.  Overwintering butterflies need cover, leave  dead foliage of perennial plants to provide winter cover - brush piles can also  provide some winter shelter.
        
        Food: Food sources can either be host plants for laying eggs  and providing food for the caterpillars, or the plants can be a nectar source  for the adult butterflies to receive sugar, water, amino acids, proteins,  enzymes and vitamins. A garden of diversity - growing a selection of woody,  herbaceous and vine species - will help attract a greater variety of butterfly  visitors. The butterfly season, depending on the climate, can last from early  spring to late fall.  It’s important to  provide a steady source of nectar plants by planting annuals, perennials,  shrubs and trees that bloom in succession. If the nectar source runs out, the  adult butterflies will look elsewhere for food. 
        
        Not all flowers are equally attractive to butterflies.  Plants with flower clusters, such as milkweed, provide a place to land and are  big enough to support large butterflies. Composite flowers, such as asters,  also provide a landing place. The size of the flower does not determine the  quality of the nectar as many herbs have small flowers but offer rich nectar.  Plants that receive a minimum of 6 hours of sun each day have more nectar and  healthy plants - growing in good, fertile soil - also produce more nectar.
        
        

        Butterflies are near-sighted. Planting  flowers in groupings – 3 or more - will attract butterflies more than a single  flower. Large sweeps of vivid color (purple, yellow, orange, pink and red) will  be more alluring as will scented flowers. Butterflies rely on their sense of  smell to help locate nectar flowers and have a highly developed sense of smell  in their antennae. When selecting flowers for the garden, remember that the new  hybrid flower varieties often have little nectar. Choose open-pollinated,  fragrant, flowering plants. Extend the bloom season by pinching back the stems  of annuals, in the early season, to create a fuller plant that has more blooms.  Annuals and perennials often benefit from deadheading. Removing the spent  flower stimulates the plant to produce more blooms for longer periods of time.
        
        Water: In addition to flowers, provide a water source near  the nectar flowers by forming a puddle or shallow trench. To make a permanent  puddle, bury a shallow container of wet gravel or wet sand. Add a few flat  rocks for landing and keep the container filled with water.
        
        Growing your own flowers from seed is a great way to bring  in many different species that butterflies use as a nectar source. Some of the  species are difficult to find, and growing from seed is just a fraction of the  cost of nursery plants. In recent news, you may have heard of systemic  pesticides that are used in many nurseries to produce a beautiful plant  specimen that is sellable. If you want to make sure that you’re completely  avoiding the possibility of pesticides, which could potentially kill the  insects that you’re attracting, grow your own flowers for use in your butterfly  garden.
        Following is a general collection, in no  specific order, of 10 flowers that are rich in nectar and known for being  attractive to butterflies. There is brief information on each flower, with tips  on care and how to grow from flower seeds. The collection has both species that  are native to the United States and not. Growing native species is always the  best way to feed your local native butterflies. If you want to have an exclusively  native garden, you would need to research your local area for native, nectar  rich flowers.
    
        
        
Cosmos  are renowned for the profusion of blooms, from late spring until fall, and they  are especially lovely when grown closely together to create a backdrop in the  garden. These lovely flowers are also attractive to butterflies and beneficial  insects, and the benefits of growing these flowers have only just begun!
        Native to Mexico and South America, it is said that Cosmos  were grown by Spanish priests in their mission gardens, and that they were the  ones who named the flowers after the Greek word “kosmos” which means harmony or  ordered universe. The evenly spaced and orderly petals inspired the name.  Cosmos are said to symbolize balance and harmony.
        Cosmos belongs to the vast family of plants known as  Compositae. There are approximately 25 known species of Cosmos, but two annual  species are the most familiar to the home gardener:
        
            - Cosmos  sulphureus – Sulphur Cosmos, Yellow Cosmos, Orange Cosmos, Klondike Cosmos.  In this species, the blooms are always in shades of yellow, orange or red, and  the leaves are long with narrow lobes and slightly hairy margins. The blooms  can be 2 - 3 inches in width and daisy-like in appearance. Native species can  reach 4 - 7 feet in height, but the cultivated varieties are not as tall,  usually ranging from 1 - 3 feet.
 
            - Cosmos  bipinnatus – Garden Cosmos, Tall Cosmos, Mexican Aster, Cut Leaf Cosmos. This  species has 2 - 3 inch white flowers or flowers in shades of lavender, pink and  maroon. The leaves are finely cut, appearing almost thread-like, the foliage  looks similar to ferns and has a very lacey appearance. Height can vary from 1 -  6 feet. There are many cultivated varieties offering different heights, colors,  and variation in blooms such as double and picotee.
 
        
        Annual Cosmos are considered to be easy to grow from flower  seeds. Choose a location that receives 8 hours of direct sun. Cosmos will grow  in partial shade but the number of blooms will be less. Sow 
Cosmos seeds directly outdoors in the spring once soil temperature is at least 65°F and  danger of frost is past. Prepare the soil by raking through to loosen it and  remove weeds, scatter the seeds, rake them under no more than 1/16 inch, and  keep the soil moist. The Cosmos flower seeds usually germinate in 7 - 21 days.  Early pinching of the seedlings will encourage branching and will increase the  density of the plants. Blooms usually appear in 2 - 3 months after seeding. 
        
        Rich, fertile soil is not needed for growing Cosmos but  well-draining soil is. Excess fertilization of Cosmos will produce lots of  foliage but few blooms. Water sparingly after seedlings emerge, but water  deeply to make the plants more drought hardy. Cosmos will self-seed, but they  are not considered to be aggressive. Deadhead the spent blooms to prolong the  flower display. The plants can be cut back to 12 - 18 inches and will re-bloom  in about 30 days. The stems can be somewhat weak, so staking may be required,  as well as some protection from wind, especially for the taller cultivars.
        
        Cosmos seeds grow under the worse conditions, yet they provide  beautiful blooms that provide nectar for butterflies and make excellent cut  flowers. It’s best to cut the flowers in the morning and then immediately place  them in tepid water. Remove the foliage from the stems before arranging. Cosmos  can also be preserved nicely.
        
        Grow Cosmos in a location where they can receive  lots of admiring glances; they make such a warm, colorful addition to any  flower garden!
    
        
        Echinacea, or Coneflower, as it’s commonly called, can be  described as a vigorous perennial that is fairly drought tolerant, performs  well in full sun to partial shade, and likes well-drained, fertile soil with a  neutral pH. Echinacea will grow in USDA Zones 4 - 9, and some species will  perform in zones 3 - 10. They are native to the mid-western and southeastern United  States. Many species will form a clump up to 3 feet wide and will reach 3 feet  in height with a long taproot, giving them good drought tolerance once well-established.
        
        Echinacea will enhance any flower border or garden, and it’s  lovely when grown in meadows and naturalized settings. The flowers are  aromatic, daisy-like with slightly drooping petals, normally in shades of  lavender and purple (although some cultivars are red, white and yellow) with an  iridescent orange-red-brown, coned center. The name comes from the Greek word “echinos”  which means hedgehog, and refers to the spiny cone. The flowers are arranged  individually on long, sturdy stems, and the foliage is simple, lance-shaped and  slightly rough. The bloom season is long, lasting much of the summer and into  the fall. Echinacea is great for cutting with a long vase-life of 5 - 7 days.
        
        

        There  are several species of Coneflower, and some of the more common are: 
        
            - Echinacea  purpurea - Purple Coneflower, is  the species most often seen in residential gardens. It performs best in lower  elevations where winters are milder. It also tolerates wet soil. 
 
            - Echinacea  angustfolia - also called Narrow Leaf Purple Coneflower, grows best at  higher elevations where winters are cold.
 
            - Echinacea pallid - known as Pale Purple Coneflower, has petals that are extremely drooping.
 
            - Echinacea  paradoxa - Yellow Coneflower.
 
        
        
        Commercial growers recommend a pretreatment of cold/moist stratification  for 30 - 90 days prior to planting 
Echinacea  seeds in the spring after frost season has passed. In a prepared  seedbed that is weed free, broadcast Echinacea seeds at a rate of 12 pounds per  acre. Lightly rake the flower seeds into the soil, covering the seed with no  more than 1/8 inch of soil. Keep the seeds moist, and with an optimal  temperature of 70° - 75°F, germination is usually within 2 - 4 weeks. Propagation  from root cuttings is also reliable when done in the fall.
        
        Deadheading the spent flowers will promote additional  blooms; however, leaving the flowers to dry will also attract songbirds in the  winter. Echinacea plants should be divided every few years to keep them  blooming well. Echinacea does not compete well with weeds, so weeds must be  kept cut down, and mulching around the base of the plants with organic matter  will help suppress weeds. Extra fertilizer is not needed if organic mulches are  added each year to the base of the Echinacea clump.
        
        Purple Coneflower was widely used by the American Indians as  a remedy for illnesses and snake bites. Today, Echinacea is reported to improve  the body’s immune system, and it’s used in treating respiratory illnesses, as  an anti-inflammatory and in treating wounds. In commercial use, Echinacea roots  are harvested after 3 - 4 years of growth as a medicinal herb, although the  entire plant can be dried and used in teas.
        
        Echinacea is a marvelous perennial to add to your landscape!  Not only do butterflies love to sip the rich nectar, but it’s a hardy flower  that does not demand tremendous care in order for it to perform its best.
    
        
        Growing Agastache is a sure winner for both the gardener and  the wildlife! It is a relative to the mint family. The flowers are high in oils  and make great insect attractants in the garden. The foliage is attractive and  endures for months, and it is aromatic. Stiff, upright stalks have whorls of  brightly colored flower spires. The colors are commonly purple to lavender, but  there are also blooms in pink, rose, blue, white and orange. Agastache is very  well suited for a cottage garden, but it can fit nicely in any border, and is  even a standout in the summer vegetable garden. 
        
        There are several well-known Agastache varieties:
        
            - Agastache foeniclum – known as Anise Hyssop or  Giant Blue Hyssop, this variety has a definite licorice aroma and blue to  purple flowers. The leaves are used for flavoring or teas and were widely used  as a medicinal herb by the Native Americans.
 
            - Agastache Mexicana – referred to as Mexican Giant  Hyssop; it is native to southern North America and Mexico. The leaves are also  used for teas and in salads.
 
            
Agastache  cana – called Hummingbird Mint, Mosquito Plant, and Bubblegum Mint. It has a  distinctive bubblegum scent with rosy-pink colored flowers.  
        
        Agastache is propagated through cuttings and flower seed. 
Agastache seeds can be sown indoors in late winter for a transplanting outdoors in May once  frost danger has passed. Using a sterile seed starting mix, the flower seeds  should be pressed into the soil but not covered. Keep the seeds and seedlings  moist. Agastache plants grown from seed will take two years to bloom.
        Agastache is an easy, undemanding perennial to grow, preferring  sun but tolerating some light shade. It dislikes waterlogged soil, so drainage  is very important for a good performance. Provide a complete organic fertilizer  each spring. Mature plants require a moderate amount of moisture and can dry  out in-between waterings. If growing as an herb, harvest fresh leaves just  before blooming for best flavor. If needed, the plants can be divided in the  fall. Division will help keep the plant robust and healthy. In areas with very  cold winters, a heavy mulch gives extra protection. When different varieties  are grown together, cross pollination may occur. Deadheading the spent blooms  and removing any volunteers will help prevent cross pollination.
        
        
        These striking and versatile flowers are also  great for cutting. They have lengthy stalks and last well in the vase.  Agastache will win your heart, and because it’s a known nectar plant, you’ll  also win the adoration of many buzzing and delightful insects who will call  your garden home!
    
        
        Pentas lanceolata are native to east Africa and southern  Arabia where they grow as sub-shrubs with woody stems at the base and  herbaceous stems above. Pentas are only perennials in USDA zones 9 - 11, but  they can easily be grown as annuals, and they are quite adored by butterflies  and hummingbirds. Pentas may not be as well-known as some flowers, but it’s a  fact that they are a delight to butterflies, hummingbirds and gardeners alike!
        
        

There  are a few common names for the flower (starflower, Egyptian star flower, Egyptian  star clusters, and Egyptian stars), but they are used more outside of the  United States. Pentas is both a descriptive name and the Greek word for “five.”  The dense clusters are made of long-tubed, star-shaped flowers, and each flower  has five floral petals. The clusters can reach 3 - 4 inches across, and their  colors are in vivid shades of white, pink, red, and lavender. Some are  two-toned and 
all are extremely attractive to butterflies, and the red  and dark pink varieties are loved by the hummingbirds. The contrasting dark green  leaves are lance-shaped, 3 inches long and deeply veined. The attractive  foliage provides the perfect back-drop for the prolific clusters of flowers. 
        
        Pentas are very well suited to containers, planters, and  hanging baskets. For large garden beds, Pentas are beautiful in mass plantings.  They perform best in fertile, well-drained soils with regular moisture. They  will flower in full sun and in light shade. Less than 6 hours of sun will  reduce flowering. Prepare a bed by adding 3 - 4 inches of organic matter and  tilling it into the soil.  A soil pH of 7  is preferred, so in acidic soil, add lime into the soil before tilling. Once  the plants are established, they are fairly drought and heat tolerant. Pentas  have a fast growth rate, and their growth habit creates a rounded, dense plant.  In their native habitat, Pentas grow 3 - 6 feet in height, but in non-tropical  climates, they can reach 24 - 30 inches in height and about the same in width.  There are also dwarf varieties that only reach 12 inches in height and are  well-suited to containers.
        
        When grown as a perennial, Pentas will bloom throughout most  of the year. Each winter, prune plants back to encourage a compact, bushy  growth habit. In USDA zone 8, apply heavy mulch over the plants after they have  been cut back to the ground to help them over winter. In colder zones, Pentas  can be dug, cut back and stored in soil. While storing, water the plants  occasionally to keep the roots from drying out and then re-plant in the spring  once danger of frosts have passed and fertilize. To help Pentas have a  bountiful supply of blooms, fertilize regularly throughout the growing season  and remove the spent flower clusters. The dwarf varieties are also grown as  house plants in bright, sunny windows.
        
        Propagation is by cuttings or from flower seeds. Start the 
Pentas seed indoors in late winter. The seeds are tiny, so do not cover them with soil as  they require light for germination. When grown from flower seed, about 14 weeks  are required to produce a blooming plant, and a good light source is needed for  proper growth. Pinch back the early growth in order to encourage bushier  plants.
        
        Gardeners have said that butterflies will visit  Pentas before any other flowers, and that butterflies can be seen circling the  flower clusters waiting for their turn to enjoy the rich nectar. Pentas offer a  profusion of color, wonderful nectar for butterflies and hummingbirds, and they  require so little maintenance. In addition … it may be difficult to bring  yourself to cut some of these gorgeous flowers, but they are excellent for  cutting and do well in the vase. Wow, what an amazing flower to add to your  summer landscape!
        
    
        
        Salvias are also known as sages, and they are indispensible  for the gardener who wants to attract hummingbirds, butterflies, and bees to  the garden with long-blooming, beautiful colors. Salvia flowers are part of a  very large genus of plants in the mint family; they have square stems and often  an aromatic fragrance. Included in that family is the popular and well-known  culinary herb, sage, that is used with poultry and to flavor stuffing. Salvia  comes from salveo, which means “save.” This name refers to the medicinal value  that is associated with this genus, and historically they were seen as herbs  with healing qualities.
        
        Salvias provide a wonderful source of both nectar and  pollen. The upright flower spikes contain numerous blossoms that stay open for  an extended amount of time, and their attraction is obvious as the  hummingbirds, butterflies and bees become frequent visitors. Salvias are  excellent for large flower beds where they can be planted in a mass grouping.  The smaller varieties are also very nice for containers.
        
        There are over 900 Salvia species known around the world,  and their habitat varies from deserts, rocky mountainous regions, to moderately  moist areas. Typically, Salvias like full sun, but tolerate light shade, and  they prefer moist, well-drained soil. There is a wide variety in forms, textured  foliage, and brightly colored flower spikes. The colors can be in shades of  reds, pinks, white, violets and blues. Depending on the species, they can be  annuals, biennials, perennials or shrubs. Some of the Salvia species include:
        
            - Salvia officinalis – Kitchen sage
 
            - Salvia sclarea – Clary Sage
 
            - Salvia azurea – Blue Sage, hardy to zone 5, 
 
            - Salvia coccinea – Texas Hummingbird Sage or  Scarlet Sage
 
            - Salvia splendens – Pineapple Sage
 
            - Salvia horminum – Annual Clary
 
            - Salvia farinacea – Mealy-cup Sage
 
            - Salvia leucantha   - Mexican Bush Sage
 
        
        
Even  though Salvias are very attractive, they also repel deer and rabbits. Many  types are also suitable for xeriscaping, and there are no diseases or insects  pests that are problematic. They require very little work, and they provide  color in the garden from late spring through early fall. They are also  quite lovely when cut and added to fresh  arrangements. Some species, such as 
Salvia  farinacea, preserve well. To dry, cut the flowers before the top fourth of  the flowers are open; tie several stems together and hang them up-side-down in  a dark well-ventilated place.
        
        Salvias are propagated by cuttings or flower seeds. The 
Salvia seeds can be started indoors 10 - 12 weeks before the last frost is expected. The  seeds need light for germination, so press the flower seeds into the soil but  do not cover them. Wait to plant annual and semi-hardy species until after all  danger of frost is past. Salvias are known to re-seed but are non-aggressive  and non-invasive. Deadheading can be done to encourage more blooming and to  prevent self-sowing. Because Salvias are heavy blooming, they benefit from some  fertilizer. Fertilize the plants once a month with a balanced water-soluble  fertilizer, or add a slow-release fertilizer at the time of planting. For the  perennial species, wait until new growth begins to show in the spring before  cutting back the old stems. Perennial Salvias can be divided in the early  spring before new growth begins.
        
        For a neat, attractive, low-maintenance plant that brings  long-lasting beauty to your garden, nectar and pollen to the butterflies, grow  a Salvia plant or two! The choices are many, but it’s guaranteed to be a  charming addition to your beds and borders, and you’ll also have a few new  winged friends who admire the flowers too.
        
    
        
        Yarrow may look lacy and delicate, but it’s a hardy  perennial that brings both beauty and nectar to the garden. If you are  attempting to bring butterflies to your landscape, Yarrow is considered to be  one of the top ten favorites for many species of butterflies. 
In addition to being useful in the garden, Yarrow makes a very nice cut  flower, and it lasts well in the vase. The flowers also dry and preserve well,  with the yellow varieties keeping their color the best.
        
            With a large variation in sizes - from a dwarf, creeping  ground cover to a tall, nearly 4 foot tall plant - there is likely to be just  the right placement for Yarrow in your landscape. The flowers are in shades of  white, red, pink, and yellow, and they typically bloom from late spring through  fall. The clustered, flat-topped flowers packed in a composite head allow the  butterfly to use its long tongue to drink nectar from deep within the flower.  Yarrow foliage has a spicy aroma with colors varying from dark green to gray  green. The foliage is fine, feathery and covered with soft wooly hairs.
        
        

This  perennial herb has a long history of medicinal use. Legend says that is was  named after the Greek mythical hero, Achilles, who gave it to his men to apply  to battle wounds. There have been few scientific studies done on the  effectiveness of the herb, but it has been traditionally used for centuries to  treat minor wounds and bleeding. It has also been taken by mouth to reduce  inflammation, and to relieve anxiety and insomnia. Native Americans made tea  from the leaves to treat headaches, toothaches and colds. During the Civil War,  the medicinal herb was widely used to treat the soldiers’ wounds, and it was  then named “Soldier’s Woundwort.”
        
        A member of the aster family, Yarrow is closely related to  chrysanthemums and chamomile, and the aromatic foliage resembles the scent of  chamomile. It is fairly deer resistant and flourishes in meadows and along  roadsides. It can spread by both seeds and rhizomes. 
The spreading nature of Achillea plants allows it to be used as a ground  cover. 
        A few of the more common varieties are:
        
            - Achillea  filipendulina – Fernleaf Yarrow
 
            - Achillea  millefolium – Common Yarrow
 
            - Achillea  tomentosa – Wooly Yarrow, Dwarf Yarrow
 
            - Achillea ptarmica – Sneezewort, Sneezeweed
 
        
        Propagation of Yarrow includes both flower seeds  and division of plants. Yarrow seeds can be started indoors in the late winter or early spring. Achillea  seeds germinate best if they are gently pressed into the pre-moistened soil,  but they should not be covered. Direct seeding can be done in late spring,  early summer or fall, when soil temperatures are 60 - 65°F. Flower seeds and  seedlings require consistent moisture. When grown from seeds, Yarrow requires 2  years for blooming.
        
        Yarrow adapts to a wide variety of soils, but  it prefers sandy or gravelly loam. A position in full sun is best, but it will  tolerate light shade. Achillea Yarrow is fairly drought tolerant; however, avoid  over watering and excessive fertilization as the plants can become leggy. A  spring division is recommended every 2 - 3 years to maintain a vigorous plant.  The taller Achillea plants can require some staking. Spent flower clusters can  be removed as they fade to prolong the bloom time.
        
        Don’t be fooled by the delicate beauty of  Yarrow. It’s a tough perennial that handles some neglect, yet it will provide a  wonderful source of nectar for butterflies and other beneficial insects. The  blooms are also great for cutting, so it’s truly a win-win flower for every  landscape!
        
    
        
        Nothing brings glorious color to the landscape like  Black-eyed Susan! These daisy-like flowers are native to most of the United  States, they have a long bloom season, they’re great for cutting, and  butterflies love them. What’s not to like about these incredible flowers?
        

There  are about 30 Rudbeckia species that can be annual, biennial or perennial. There  are countless varieties and cultivars that have been introduced and different  forms of Rudbeckia can be found naturalized across the United States. Some of  the species include:
        
            - Rudbeckia laciniata – Cut-leaf  Coneflower
 
            - Rudbedkia triloba – Brown-eyed  Susan
 
            - Rudbeckia fulgida – Orange  Coneflower
 
            - Rudbeckia hirta – Black-eyed  Susan, Gloriosa Daisy
 
        
        Rudbeckia hirta  was named after the Swedish father and son  professors of botany, O.J. Rudbeck  (1630 - 1702) and O.O. Rudbeck (1660 - 1740). The additional 
hirta means “rough” as the plant has  course hairs on the stems and on the lance-shaped leaves. It is commonly  called Black Eyed Susan, and it grows in meadows, prairies and along roadsides  in sandy, loamy or even clay soils. The flowers are 2 - 3 inches across or more  and in colors of yellow, orange, orange-red and bi-color with a large brownish-black  domed center.  The petals may be single  or double. The stems are strong and are excellent for cutting often lasting in  a vase for 6 - 10 days.
        
        Rudbeckia plays an important role in nature, and they are  considered to be the most widely known wildflower. Black-eyed Susans are very  competitive and they can push other plants out of an area. They are also  considered to be a pioneer plant, meaning that they are one of the first to  grow on land that has been destroyed by fire. Medicinally, Rudbeckia root was  made into tea to treat worms and colds. The root was also used to make a  topical wash to treat wounds and snakebites. It is said to have immune-stimulant  activity similar to Echinacea.
        
        Rudbeckia is propagated by division, cuttings and flower seeds.  The 
Black-eyed  Susan seeds can be started indoors or directly outside and are known for  producing flowers in about 14 weeks after seeding. For indoor seeding, start  the flower seeds 6 - 8 weeks before the last expected frost. Rudbeckia seeds  should not be covered but pressed into the soil for good contact; the flower seeds  need light for germination. The plants reach 2 - 3 feet tall and form a clump  that’s 2 - 3 feet wide. Once established, Rudbeckia is very forgiving of  neglect and can bloom from mid-summer until frost.
        
        Grow Rudbeckia in full sun and well-drained, moist soil.  They have a moderate drought tolerance.   Deadheading the spent flowers will encourage continued blooming, but if  a few flowers are left to go to seed, Black-eyed Susans will remain year after  year by re-seeding. It’s recommended to water at the roots instead of overhead  to help avoid fungal disease, but in general, the plants are very resistant to  both disease and pests.
        
        Rudbeckia flowers are versatile, offering a beautiful color  display whether planted alone, in a container, in a mass, along a border, or  along a fence line. They are ideal for attracting bees and butterflies, and if  they are left to dry, the ripe cone heads provide seeds to hungry birds in late  fall and winter.
        
    
        
        Two closely related perennials that are rich in nectar for butterflies,  showy and attractive in the garden, and also have medicinal value are:
        
            - Eupatorium  perfoliatum - known as Common Boneset, and
 
            - Eupatorium  maculatum - known as Joe Pye Weed
 
        
        Eupatorium dates back to 115 BC and was named from the Greek  name Mithridates Eupator, King of Pontus. It was said that he had discovered an  antidote to a commonly used poison using a plant of this species. Boneset is  native to North America, found in the eastern and central portions of the  United States, and it was a widely used herb among American Indians. It was a  medicinal herb used to make a tea that treated influenza and respiratory  conditions. Other common names for 
Eupatorium  perfoliatum are: Feverwort, Ague Weed, Indian Sage, Wood Boneset,  Crosswort, and Sweating Plant. There are chemical ingredients in Boneset, such  as flavonoids and terpenoids, that have antibacterial, anti-inflammatory, and  antimicrobial benefits. 
        
        
Eupatorium perfoliatum can reach up to 5  feet tall, and it blooms from July through October. The flower heads are large  and flat and are made of ¼ inch white flowers. The flowers are showy,  long-lived and very attractive to wildlife. The leaves have a wrinkled texture,  and they grow on opposite sides of the stem, but they are joined at the base,  encircling the stem. It appears that the stem is growing through the leaf, so  to ancient herbalists, this indicated that the plant would be useful in setting  bones. The Boneset leaves were wrapped with bandages around splints to heal  broken bones.
        
        Joe Pye Weed is tall - up to 6 feet - and bushy with stems  that are spotted or evenly purplish. The leaves are sharply toothed and form in  whorls of 4 - 5. The flat-topped, branched cluster of flowers is in shades of  pink to purple and is lightly scented. Bloom time is July through September and  the flowers are very showy especially when planted in mass plantings.
        
        Other common names for 
Eupatorium  maculatum are: Spotted Joe Pye Weed, Purple Boneset, and Spotted Trumpet  Weed. This Eupatorium also has medicinal benefits. The legend behind 
Eupatorium maculatum is that an American  Indian, Joe Pye, used this plant to cure fevers and treated American colonists  during an outbreak of typhus.
        
        Eupatorium is attractive to birds, butterflies and bees,  with 
E. maculatum being the favorite  of butterflies. It provides nectar for butterflies such as the Giant  Swallowtail, Tiger Swallowtail and the Orange Sulphur. Sadly, it is more and  more difficult to find Eupatorium in the wild, but nurseries that carry native  plants will often have it available for purchase. 
        
        In general, Eupatorium prefers a specific growing  environment such as full sun to partial shade, wet ground, on the edges of  swamps, along streams, or in meadows and marshlands, and it prefers sandy,  loamy or limy soil.
        
        Propagation of Eupatorium is either through plant division  or flower seeds. 
Eupatorium  seeds can be started in either late fall (dormant planting) or early  spring. Spread the wildflower seeds over a prepared seedbed that is weed free  and tamp the seeds in, covering with no more than 1/8 inch of soil. Keep the  seedbed moist. Pinch back the young Eupatorium seedlings to promote shorter,  bushier plants that are not as vulnerable to the wind. Once grown, apply a  balanced liquid fertilizer when the flower heads appear and apply every other  week until flowering is done. Eupatorium plants can be divided in spring or  fall.
        
        Whether you chose to have Eupatorium stand alone, in a mass  planting, or select one or two plants for the back of the flower border, this  attractive perennial will give a wonderful, long-lasting display and will be  attractive to beneficial insects. In addition … you have some great folklore to  share with your neighbors on the history of these plants!
        
    
    
    We can’t forget Asters for our butterfly garden! Asters have  long been grown for their long lasting flowers and ease of care. There are  about 600 species, and they are great for the wildlife garden. They attract  both bees and butterflies and are a great source of pollen and nectar for  wildlife in the latter part of the season when many flowers are done blooming.
    Some of the species include:
    
        - Aster thomsonii – Himilayan Aster
 
        - Aster amellus – Italian Aster
 
        - Aster novi-angliae – New England Aster
 
        - Aster alpinus – Alpine Aster
 
        - Aster tongolensis – East Indies Aster
 
        - Aster novi-belgii – New York Aster
 
    
    The name Aster is  derived from the Greek word meaning “star” and refers to the star-like form of  the flowers. The plant typically has a loose bushy growth habit with  flowers forming on upright stems that rise above the foliage. There is a wide  variety of colors - shades of lavender, white, red, pink and purple and often  have a yellow center. Depending on the species, the bloom time can differ.  Alpine Aster is a spring/early summer bloomer  and many of the others are late summer and fall bloomers, which will bloom on  into October. For many gardeners, Asters are the mainstay for the fall display. 
    
    Asters grow best in  full sun to partial shade, and they need well-drained soil, a moderate amount  of water, and good air circulation. Powdery mildew is a common disease, so it’s  also suggested to water at the base of the plant instead of overhead and to  allow for plenty of space between plants. Division is needed every 3 years to  help keep the plant vigorous.  In early  spring, once new growth is evident, divide the plant. The outer portions of the  plant can be re-planted, and the spent inner portion should be discarded. Some  species may reseed, so deadheading is helpful to remove the spent flowers  before they go to seed.
    
    Propagation is by  division, cuttings or flower seeds. 
Aster seeds started indoors will germinate in  approximately 15 days and when started outdoors, germination will take 20 - 30  days. The seed should be covered lightly with soil, 1/16 of an inch. When grown  from flower seed, pinching the young plants encourages a bushier growth habit. 
    
    The various species  range in size from 8 inches to 5 feet. The taller varieties may need  some staking to keep from flopping over, but they also do well with a good  pruning by mid-June. It’s suggested to cut the plant back by one-half.  Cut outer stems shorter than the center stems  to create a nicely rounded shape. It may seem severe, but cutting it back and  shaping it encourages the flowers to form closer to the base and eliminates  ugly brown stems. The blooming is only delayed by a few days, and a much prettier  plant is produced.
    
    A well-cared for Aster can bring a display of fireworks to  the fall garden scene. You’ll be happy for the late season color, and the  butterflies will be happy for the food source!
    
    
    
        
        Make a great addition to your herb garden or flower border  and grow Bee Balm! This perennial has many attractive features that might catch  your attention, as well as the attention of the hummingbirds, butterflies, and  bees that enjoy its rich nectar.
        
        Monarda is native to North America. It is in the mint family  and common names include Bee Balm, Oswego Tea, Wild Bergamot, Horsemint and  several more. The plant has a clumping, upright growth habit, square stems, and  it spreads by underground rhizomes. The tubular flowers are typically shades of  red, purple, pink and white, and resemble small fireworks. They are late  blooming, adding lots of color to the garden when other flowers have finished.
        
        

The  early American settlers found that the dried Monarda leaves made a good tea,  naming the plant Oswego tea as the plant grew along the Oswego River. After the  Boston Tea Party, Oswego tea was used instead of the British black tea. Long  before the Europeans came to America, the Native American tribes were using Bee  Balm as a cold remedy and an antiseptic. Even today, the essential oil is being  scientifically researched for its benefits in treating wounds and prevention  against infections.
        
        Species include:
        
            - Monarda  didyma – Oswego Tea
 
            - Monarda fistulosa – Wild    Bergamot
 
            - Monarda punctata – Horse Mint
 
            - Monarda citriodora – Lemon Bee Balm
 
        
        Bee balm plants perform best with 6 hours of sun each day,  and they tolerate some light shade. Plants grown in shade will not flower as  heavily, and they are more susceptible to powdery mildew. Monarda prefers moist  but well-drained soils. During dry periods watch for the foliage wilting, water  at the roots and soak deeply. A mulch around the base of the plant will help  hold in moisture as well as suppress weeds. These perennials do not require  much fertilizer. A small amount of an all-purpose fertilizer, like a 10-10-10,  sprinkled around the base of the Monarda plant in the early spring is  sufficient. Because the Bee Balm plant spreads, it should be divided every 2 -  3 years in the early spring. Divide the clump into sections using a sharp  knife. Discard the old center of the plant, and then plant each section making  sure that there are several shoots and good roots. To help avoid powdery  mildew, grow Bee Balm where there is good air circulation, avoid overhead  watering, and space the plants about 24 - 30 inches apart. In the fall, cut  back the plants, remove old stems and foliage, and clean up the old mulch.
        
        Monard propagation is through flower seeds, cuttings or root  divisions. The 
Bee  Balm seeds can be started indoors in the late winter for transplanting  outside. Or the Monarda seeds can be started directly outside in a weed free  seed bed that has been cultivated and raked to a fine tilth. Cover the flower seeds  thinly with soil, no more than the thickness of the seed. The seeds can be sown  outdoors in the early spring before the frost season has ended and in the fall  allowing 8 weeks before frost season to begin. When grown from flower seeds,  Monarda will not have blooms until the 2nd or possibly even the 3rd  year.
        
        In addition to inviting bees, butterflies and hummingbirds  to the garden, Bee Balm is a great flower for cutting, and the foliage is  wonderfully aromatic and has a minty scent. Monarda is long flowering, and dead  heading the spent blooms encourages more flowers. Both the flowers and leaves  can be dried and used in potpourri and sachets. For drying, cut the flowers  just before they open.
        Because of the plant’s height, place the plant  in the middle or toward the back of the flower border. But always make sure  that Bee Balm is in clear view from the window so that you can enjoy watching  the wildlife that comes to visit!
    
    
    
    
    
One  particular flower that is an invaluable food source for Monarch butterflies is  Milkweed. It is scientifically known as Asclepias, and there are many varieties  that are native to North America. The common name really does a disservice to  this incredible plant. Without the Milkweed, the Monarch butterfly cannot  exist. This native wildflower is a host and nectar plant – the adult Monarch  butterfly lays its eggs on the Asclepias plant, and as the caterpillars emerge,  they eat the leaves of the plant. Even more fascinating is the fact that  Asclepias are poisonous, but instead of the toxin killing the hungry  caterpillar, the caterpillar becomes poisonous itself. Even as an adult  butterfly, the Monarch is poisonous to its would-be predators, which wisely  leave it alone. Monarch butterflies cannot exist without Milkweed plants, but  tragically colonies of these wildflowers are being destroyed as buildings and  developments go up. The good news is that every home garden can grow these  important and attractive flowers!
    
    
    Some of the more familiar Milkweeds and their  common names:
    
        - Asclepias  speciosa – Showy Milkweed
 
        - Asclepias  syriaca – Common Milkweed or Silkweed
 
        - Asclepias  incarnata – Swamp Milkweed
 
        - Asclepias tuberosa – Butterfly Weed or Butterfly Milkweed
 
        - Asclepias curassavica  – Bloodflower, Tropical Milkweed, Mexican Butterfly Weed
 
    
    There is little care in growing Milkweed, however finding  the plants can be more challenging. The plants are not commercially available,  but nurseries specializing in native plants will often have Asclepias, and they  can readily be grown from 
Milkweed seeds.  Common Milkweed is one that may be difficult to contain because it spreads  easily by both seeds and rhizomes, so in the home garden, the other varieties  that are less aggressive are usually preferred. Monarch butterfly experts  report that Asclepias curassavica is the most preferred by the butterflies.  It’s a tender perennial that is often grown as an annual. In general, Milkweed  plants prefer a well-drained, sunny location. They do not require additional  fertilizers. Deadheading can extend the bloom time for some varieties.
    Milkweed can be propagated by stem cuttings  or flower seeds. 
Asclepias seeds germinate better with a cool, damp  stratification. A suggested method is to place the flower seeds in a bag or  container of moistened peat moss, and then place it in the refrigerator for 6 -  10 weeks or more. The seeds can be then directly seeded outside in warm soil or  started indoors in trays. The flower seed and seedlings will need regular  attention and moisture; however, the mature plants will tolerant some drought.  The mature Asclepias forms a long tap root, so where they are planted, they  should be left, and division of the plants is not recommended. When grown from flower  seeds, Milkweed will bloom the second year of growth. Bloodflower seeds do not  require stratification, and they do not form the long tap root that the other  varieties have.
    
    
    Asclepias have been used as a medicinal herb  for centuries. In fact, the genus was named after the Greek god of medicine.  The plants contain cardiac glycosides which increase the force of heart  contractions, and also have a potential anti-cancer application. The plants are  potentially toxic to livestock and humans, but large quantities are required to  be consumed before poisoning. Many insects and hummingbirds will eat the nectar  and pollen from the flowers, but the flowers do not contain the glycosides.
    
    
    When growing Milkweed in your garden, it’s  suggested to plant them in groupings. Butterflies are more likely to notice a  group of the plants, and the females will seek them out for egg laying. It’s  important to avoid chemical insecticides on Asclepias, as they may kill the Monarch  eggs and larvae. Milkweed is not only lovely to grow, but you can have such  satisfaction knowing that you’re providing for a butterfly species that depends  on this amazing plant!
    
    
    

    Gardening and attracting wildlife seem to go hand-in-hand.  We delight in attracting and providing food for beautiful creatures, and none  are more beautiful than butterflies. This list of nectar-rich flowers for  butterflies is only the beginning of many different trees, shrubs, herbs and  ornamentals that provide a good source of food for the adult insects. With some  more research for your particular area, you can select plant species that give  a spring through fall supply of nectar. Creating a butterfly garden is a skill  that requires some research and study. For the best success, learn more about  butterflies in your area, learn how to identify both the caterpillars and the  adults, learn about the food sources, and where they live. Collect some good  resources for study, and as with any new skill, time and experience will allow  you to reap the rewards of having many lovely butterflies flutter by.
    
    
    
Introduction
    http://umaine.edu/publications/7151e/
    http://www.aces.edu/pubs/docs/A/ANR-1290/ANR-1290.pdf
    http://easttexasgardening.tamu.edu/tips/misc/butterfly.html
    http://watauga.ces.ncsu.edu/files/library/95/Bfly%20Gardening%20factsheet.pdf
    http://apps.caes.uga.edu/urbanag/home&garden/indexFS.cfm?storyid=2561
    
    Cosmos
    http://aggie-horticulture.tamu.edu/archives/parsons./flowers/cosmos/cosmos.html
    http://www.gardening.cornell.edu/homegardening/scene4d85.html
    http://ucjeps.berkeley.edu/cgi-bin/get_JM_treatment.pl?609,1020,1022
    http://www.gardening.cornell.edu/homegardening/scene9a85.html
    http://extension.usu.edu/files/publications/publication/Horticulture_Vegetables_2013-01c.pdf
    http://www.public.asu.edu/~camartin/plants/Plant%20html%20files/cosmosbipinnatus.html
    
    Echinacea
    http://natsci.edgewood.edu/wingra/management/raingardens/Echinacea/How%20to%20Grow%20Page.htm
    http://www.uky.edu/Ag/NewCrops/introsheets/echinacea.pdf
    
    Agastache
    http://ucanr.edu/sites/scmg/Plant_of_the_Month/Agastache/
    http://www.ag.ndsu.edu/archive/dickinso/research/2000/Cultivar/1.htm
    http://www.ces.ncsu.edu/depts/hort/consumer/factsheets/herbs/agastache_foeniculum.html
    http://wisplants.uwsp.edu/scripts/detail.asp?spcode=AGAFOE
    http://greenhouse.kenyon.edu/greenhouseplants/Agastache%20foeniculum.htm
    http://www.gardeningknowhow.com/edible/herbs/hyssop/growing-agastache.htm
    
    Pentas
    http://www.gardeningsolutions.ifas.ufl.edu/giam/plants_and_grasses/flowering_plants/pentas.html
    http://www.arhomeandgarden.org/plantoftheweek/articles/Butterfly_Pentas.htm
    http://msucares.com/news/print/sgnews/sg05/sg050512.html
    http://florawww.eeb.uconn.edu/198500651.html
    http://pss.uvm.edu/pss123/tppentas.htm
    http://bygl.osu.edu/content/annual-pentas-star-cluster-or-egyptian-star-flower-pentas-lanceolata-0
    http://www.indstate.edu/facilities/grounds/pentas.htm
    http://www.extension.iastate.edu/newsrel/2004/mar04/mar0403.html
    
    Salvia
    http://www.ext.colostate.edu/pubs/columngw/gr110611.html
    http://www.extension.iastate.edu/newsrel/2003/jul03/jul0321.html
    http://www.gardening.cornell.edu/homegardening/scene81de.html
    http://www.gardening.cornell.edu/homegardening/scene4695.html
    http://www.clemson.edu/extension/hgic/plants/landscape/flowers/hgic1174.html
    http://www.gardening.cornell.edu/homegardening/scenedbe3.html
    http://www.ipm.ucdavis.edu/PMG/GARDEN/PLANTS/salvia.html
    http://hendry.ifas.ufl.edu/HCHortNews_Salvias.htm
    
    Yarrow
    http://umm.edu/health/medical/altmed/herb/yarrow
    http://www.turf.uiuc.edu/weed_web/descriptions/commonyarrow.htm
    http://www.oardc.ohio-state.edu/weedguide/singlerecord.asp?id=1090
    http://extension.psu.edu/plants/gardening/herbs/common-yarrow
    http://baker.ifas.ufl.edu/Horticulture/Yarrow.html
    http://www.ces.ncsu.edu/depts/hort/consumer/factsheets/groundcover/achillea_tomentosa.html
    http://www.gardening.cornell.edu/homegardening/scene90fb.html
    http://www.ksre.ksu.edu/bookstore/pubs/mf1069.pdf
    
    Rudbeckia
    http://www.fcps.edu/islandcreekes/ecology/black-eyed_susan.htm
    http://wisplants.uwsp.edu/scripts/detail.asp?SpCode=RUDHIRvPUL
    http://www.ces.ncsu.edu/depts/hort/consumer/factsheets/annuals/rudbeckia_hirta.html
    http://www.bio.brandeis.edu/fieldbio/medicinal_plants/pages/Black_Eyed_Susan.htm
    http://www.bio.brandeis.edu/fieldbio/Survival_Gold_Uygur/Pages/Black-EyedSusan.html
    http://www.ext.colostate.edu/pubs/columngw/gr120616.html
    http://blog.lib.umn.edu/efans/ygnews/2011/09/black-leaves-on-black-eyed-sus.html
    http://aggie-horticulture.tamu.edu/wildseed/20/20.2.html
    http://aggie-horticulture.tamu.edu/wildseed/gloriosadaisy.html
    http://www.gardening.cornell.edu/homegardening/scene701e.html
    
    Eupatorium
    http://mason.gmu.edu/~hphamb/project/plant/plant.htm
    http://www.plantoftheweek.org/week223.shtml
    http://wisplants.uwsp.edu/scripts/detail.asp?SpCode=EUPMAC1
    http://nativeplants.evergreen.ca/search/view-plant.php?ID=00298
    http://www.clemson.edu/extension/hgic/plants/indoor/flowering/hgic1559.html
    Aster
        http://www.gardening.cornell.edu/homegardening/scenef99f.html
        http://www.gardening.cornell.edu/homegardening/scened928.html
        http://www.gardening.cornell.edu/homegardening/scene912b.html
        http://www.colostate.edu/Depts/CoopExt/4DMG/Flowers/Perenls/asters.htm
        http://extension.psu.edu/pests/plant-diseases/all-fact-sheets/aster-diseases
        http://web.extension.illinois.edu/cfiv/homeowners/060427.html
        http://pss.uvm.edu/pss123/peraster.html
        http://www.uky.edu/Ag/Horticulture/gardenflowers/asters.pdf
        http://pss.uvm.edu/ppp/articles/asters2.html
        
        Monarda
        http://www.uvm.edu/~pass/perry/cohmild.html
        http://pss.uvm.edu/pss123/permonar.html
        http://pharmacology.georgetown.edu/urbanherbs/bee_balm.htm
        http://expert.hort.iastate.edu/faq/view/id/387
        http://urbanext.illinois.edu/hortanswers/plantdetail.cfm?PlantID=735&PlantTypeID=2
        http://www.frostburg.edu/aces/kids-page/monarda-didyma/
        http://www.hort.purdue.edu/newcrop/med-aro/factsheets/bergamot.html
        http://talon.niagara.edu/~mgallo/organisms/Monarda.html
        http://www.ksre.ksu.edu/ksherbs/bee_balm.htm
        
        Asclepias
        http://edis.ifas.ufl.edu/fp049
        http://edis.ifas.ufl.edu/fp050
        http://aggie-horticulture.tamu.edu/wildseed/21/21.4.html
        http://www.clemson.edu/cafls/demo/plant_profiles/asclepias_tuberosa.html
        http://www.ces.ncsu.edu/depts/hort/consumer/poison/Ascletu.htm
        http://urbanext.illinois.edu/hortanswers/plantdetail.cfm?PlantID=708&PlantTypeID=2
        http://urbanext.illinois.edu/hortanswers/plantdetail.cfm?PlantID=811&PlantTypeID=14
        http://wisplants.uwsp.edu/scripts/detail.asp?Spcode=ASCINCsINC
        http://www.ces.ncsu.edu/depts/hort/consumer/factsheets/wildflowers/asclepias_incarnata.html
        http://www.usi.edu/science/biology/twinswamps/Asclepias_incarnata.htm
        http://www.fcps.edu/islandcreekes/ecology/common_milkweed.htm
        http://agron-www.agron.iastate.edu/~weeds/weedbiollibrary/u4milkw1.html
        http://www.botany.hawaii.edu/faculty/carr/asclepiad.htm
        http://www.ces.ncsu.edu/depts/hort/consumer/factsheets/annuals/bloodflower.html
        http://nativeplants.ku.edu/research/asclepias-research/asclepias-milkweeds
        http://aggie-horticulture.tamu.edu/archives/parsons/flowers/butterfl.html
        http://www.oardc.ohio-state.edu/weedguide/singlerecord.asp?id=580