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Eryngium Seeds - Planum
SEASON
Perennial
USDA ZONES
4 - 8
HEIGHT
48 inches
BLOOM SEASON
Early summer to late summer
BLOOM COLOR
Blue
ENVIRONMENT
Full sun
SOIL TYPE
Any well drained soils, pH 5.8 - 6.8
DEER RESISTANT
Yes
HOUSE PLANT
No
LATIN NAME
Eryngium planum
SEASON
Perennial
USDA ZONES
3 - 9
HEIGHT
30 - 48 inches
BLOOM SEASON
Late spring through summer
BLOOM COLOR
White
ENVIRONMENT
Full sun to partial shade
SOIL TYPE
Loam, sand, clay, or gravel
DEER RESISTANT
Yes
HOUSE PLANT
No
LATIN NAME
Eryngium yuccifolium
SEASON
Perennial
USDA ZONES
4 - 9
HEIGHT
28 inches
BLOOM SEASON
Summer to fall
BLOOM COLOR
Blue
ENVIRONMENT
Full sun to partial shade
SOIL TYPE
Well-drained soils, pH 6.8 - 7.2
DEER RESISTANT
Yes
HOUSE PLANT
No
LATIN NAME
Eryngium alpinum
About...
Sea Holly Blue (Eryngium Planum) - Unique and stately, Eryngium Planum, commonly called Sea Holly, has been grown from flower seeds in America since the 1800's. A drought tolerant plant once established perfect for water conservation.MORE ERYNGIUM OPTIONS
Planting Directions
TEMPERATURE
60 - 72F
AVERAGE GERM TIME
21 - 28 days
LIGHT REQUIRED
Yes
DEPTH
Cover seed with vermiculite, sand or substrate after sowing
SOWING RATE
5 - 6 seeds per plant
MOISTURE
Keep soil slightly moist but not wet until germination
PLANT SPACING
18 inches
Sea Holly Blue (Eryngium Planum) - Unique and stately, Eryngium Planum, commonly called Sea Holly, has been grown from flower seeds in America since the 1800's. It can be propagated by division, flower seed and root cuttings.
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Common Questions
Where are the best places to use sea holly in the landscape?
Sea holly is an excellent option for sunny garden spots that are hard to water. It can be planted alone or in small clusters. The blue and silver hues of sea holly complement various colors, particularly yellow and orange. Try combining it with rudbeckia, coreopsis, zinnia, and cosmos. Sea holly attracts bees and butterflies but deters deer and rabbits. When used in floral arrangements, the flowers remain fresh for several days.
How long does sea holly live?
With a deep taproot that enables it to thrive in unfavorable soil conditions, a mature sea holly plant can survive for many years, eventually expanding to resemble a small shrub. Interestingly, plants in nutrient-rich soil tend to have shorter lifespans.
Does sea holly self-seed?
Sea holly will self-seed in the garden if the spent flowers are not deadheaded. The seedlings that emerge are usually not troublesome. When you spot them, delicately relocate them to create new plants. It's crucial to act promptly as sea holly grows a lengthy taproot that does not transplant well once established.
How long does sea holly stay in bloom?
Sea holly typically flowers from mid-summer to fall. To extend the blooming period or promote more blooms, remove spent flowers.
Planting Directions
TEMPERATURE
64 - 72F
AVERAGE GERM TIME
2 to 4 weeks
LIGHT REQUIRED
No
DEPTH
1/4 inch
SOWING RATE
5 ounces per 1,000 square feet
MOISTURE
Keep seeds moist until germination
PLANT SPACING
8 to 24 inches
Rattlesnake Master (Eryngium Yuccifolium) - Grown from Eryngium seeds, this unique plant grows well in full sun and moist to slightly dry conditions. With the common name of Rattlesnake Master, Eryngium Yuccifolium has bluish green foliage and spherical flower heads that measure 1/2 - 1 inch across that are made up of many small flowers. The overall appearance is rough and prickly, and the flower heads blooms from late summer through fall.
Common Questions
Is Eryngium Yuccifolium an attractant?
Yes, Eryngium Yuccifolium attracts bees, butterflies and beneficial insects to your garden.
Are plants resistant to deer?
Yes, deer and rabbits tend to dislike Eryngium Yuccifolium.
Do I need to deadhead my flowers?
To prevent self-seeding you will need to deadhead your plants.
Can I start seeds indoors?
This plant does not transplant well so it is best to start in the garden where you will want it to stay.
How is this plant used in landscapes?
This is an excellent choice for beds and borders or natural settings. The foliage of this plant is very complimentary to vibrant summer flowers.
What are some common plant pairings?
Plants such as sedum, pale purple coneflower, yellow coneflower, globe thistle, giant hyssop all look beautiful with Eryngium Yuccifolium.
Planting Directions
TEMPERATURE
64 to 72F for the first 2-4 weeks. After this period, the sowing must ...more 64 to 72F for the first 2-4 weeks. After this period, the sowing must be kept at a cold temperature between 25 and 39F for another 4 - 6 weeks...less
AVERAGE GERM TIME
28 - 56 days
LIGHT REQUIRED
No
DEPTH
Surface sow seed and press tightly in to soil
SOWING RATE
4 - 5 seeds per plant
MOISTURE
Keep seeds moist until germination
PLANT SPACING
24 inches
Sea Holly Alpinum (Eryngium Alpinum Superbum) - Eryngium Alpinum Superbum is nothing short of fantastic and is easy to grow from Eryngium seeds. It is commonly known as Alpine Sea Holly, and it is one of the showiest Sea Holly plants available on the market. The metallic stems and large thistle-like flowers mature to an intense steel blue color from summer through fall.
Common Questions
Where are the best places to use sea holly in the landscape?
Sea holly is an excellent option for sunny garden spots that are hard to water. It can be planted alone or in small clusters. The blue and silver hues of sea holly complement various colors, particularly yellow and orange. Try combining it with rudbeckia, coreopsis, zinnia, and cosmos. Sea holly attracts bees and butterflies but deters deer and rabbits. When used in floral arrangements, the flowers remain fresh for several days.
How long does sea holly live?
With a deep taproot that enables it to thrive in unfavorable soil conditions, a mature sea holly plant can survive for many years, eventually expanding to resemble a small shrub. Interestingly, plants in nutrient-rich soil tend to have shorter lifespans.
Does sea holly self-seed?
Sea holly will self-seed in the garden if the spent flowers are not deadheaded. The seedlings that emerge are usually not troublesome. When you spot them, delicately relocate them to create new plants. It's crucial to act promptly as sea holly grows a lengthy taproot that does not transplant well once established.
How long does sea holly stay in bloom?
Sea holly typically flowers from mid-summer to fall. To extend the blooming period or promote more blooms, remove spent flowers.
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