Silphium Seeds - Compass Plant Flower Seed

Silphium Seeds - Compass Plant

100 Seeds
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4.99
200 Seeds
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8.99

About...

Silphium (Silphium Laciniatum) - Commonly known as Compass Plant, this very tall flowering plant demands a second look! It is readily grown from Silphium seeds and what an interesting flower it is. Silphium is often grown with tall grasses such as big bluestem, and it prefers full sun and moist to slightly dry conditions.

MORE SILPHIUM OPTIONS

Compass plant Cup plant
ABOUT
PLANTING DIRECTIONS
VIDEOS

Flower Specifications

SEASON

Perennial

USDA ZONES

3 - 9

HEIGHT

48 - 100 inches

BLOOM SEASON

Late spring through summer

BLOOM COLOR

Yellow

GROWTH RATE

Slow

ENVIRONMENT

Full sun

SOIL TYPE

Loamy, moist to slightly dry, pH 6.1 - 7.4

FOLIAGE COLOR

Light green

DEER RESISTANT

Yes

LATIN NAME

Silphium Laciniatum

Silphium (Silphium Laciniatum) - Commonly known as Compass Plant, this very tall flowering plant demands a second look! It is readily grown from Silphium seeds and what an interesting flower it is. Silphium is often grown with tall grasses such as big bluestem, and it prefers full sun and moist to slightly dry conditions. Compass Plant has yellow flowers measuring 3 - 4 inches across that resemble wild sunflowers. It also forms a central taproot that grows best in loamy soil. The taproot can be as long as 15 feet, and it allows the Silphium Laciniatum plant to grow to imposing heights, but it may take several years for a seedling to develop into a full-sized mature plant when grown from Silphium seeds. Mature plants produce as many as 30 flowers that last many weeks. The Silphium flower is easy to maintain, resists drought, and can handle competition from other plants. Bumble bees enjoy the nectar, and birds often perch in the sturdy stems. Care must be taken not to plant Compass Plant seeds on slopes since they grow so tall they become top heavy when in bloom and could easily flop over.

How To Grow Compass Plant: Sow Silphium flower seeds directly outdoors in late fall or early winter. This particular flower seed does well with a cold, dormant planting as the cold temperatures actually help break the flower seed of its dormancy. Once spring arrives and temperatures warm, the Silphium seeds will germinate quickly. Prepare the outdoor soil by removing weeds and loosening. Compass Plant seeds can be raked into loosened soil and covered 1/4 - 1/2 inch.

Approximately 750 seeds per ounce.

Great with Pollinators!

Bumble bees enjoy the nectar of this Silphium, and birds often perch in the sturdy stems.

Great with Pollinators!

Silphium Seeds | Compass Plant

How to Grow

Sow Silphium flower seeds directly outdoors in the late fall or early winter. This particular flower seed does well with a cold, dormant planting, as the cold temperatures actually help break the flower seed of its dormancy. Once spring arrives and temperatures warm, the Silphium seeds will germinate quickly. Prepare the outdoor soil by loosening. Compass Plant seeds can be raked into loosened soil and covered 1/4 - 1/2 inch.

  • Approximately 750 seeds per ounce
  • Sowing Rate: 1 ounce per 100 square feet
  • Depth: 1/4 - 1/2 inch
Silphium Seeds | Compass Plant

Flower Specifications

  • Moisture: Keep seeds moist until germination
  • Average Germ Time: 14 - 21 days
  • Plant Spacing: 18 - 30 inches
  • Height: 48 - 100 inches
  • USDA Zones: 3 - 9
  • Season: Perennial

Planting Directions

TEMPERATURE

33 - 38F for 10 - 60 days then 65F

AVERAGE GERM TIME

14 - 21 days

LIGHT REQUIRED

Yes

DEPTH

1/4 - 1/2 inch

SOWING RATE

1 ounce per 100 square feet

MOISTURE

Keep seeds moist until germination

PLANT SPACING

18 - 30 inches

CARE & MAINTENANCE

Silphium

ABOUT
PLANTING DIRECTIONS
VIDEOS

Flower Specifications

SEASON

Perennial

USDA ZONES

4 - 9

HEIGHT

40 - 90 inches

BLOOM SEASON

Late spring through summer

BLOOM COLOR

Yellow

ENVIRONMENT

Full sun

SOIL TYPE

Loamy, moist to slightly dry, pH 6.1 - 7.4

FOLIAGE COLOR

Dark green

DEER RESISTANT

Yes

LATIN NAME

Silphium Perfoliatum

Silphium (Silphium Perfoliatum) - This towering, flowering plant is a native of the tall grass prairie and readily establishes from Silphium seeds. It is commonly known as Cup Plant and is a perennial giant which has yellow daisy-like flowers. The flowers measure 3 - 4 inches across and attract bees and birds. The name comes from the large leaves that are on opposite sides of the stem and are fused together at their base. This base forms a cup that collects water from the morning dew. Birds and insects seek out the collected water.

The Silphium Cup Plant prefers sunny settings and moist loamy soil. The root system consists of a long central tap root and many shallow rhizomes. The rhizomes help to spread the plant. The Silphium Perfoliatum Cup Plant will often form substantial colonies due to the spreading ability.

How To Grow Silphium: Sow Silphium Perfoliatum seeds directly outdoors in late fall or early winter. These particular flower seeds do well with a cold, dormant planting as the cold temperatures actually help break the flower seed of its dormancy. Once spring arrives and temperatures warm, the Cup Plant seeds will germinate quickly. Prepare the outdoor soil by removing weeds and loosening. Silphium Cup Plant seed can be raked into loosened soil and covered 1/8 - 1/4 inch.

Approximately 2,000 seeds per ounce.

Great with Pollinators!

Bumble bees enjoy the nectar of this Silphium, and birds often perch in the sturdy stems.

Great with Pollinators!

Silphium Seeds | Compass Plant

How to Grow

Sow Silphium flower seeds directly outdoors in the late fall or early winter. This particular flower seed does well with a cold, dormant planting, as the cold temperatures actually help break the flower seed of its dormancy. Once spring arrives and temperatures warm, the Silphium seeds will germinate quickly. Prepare the outdoor soil by loosening. Compass Plant seeds can be raked into loosened soil and covered 1/4 - 1/2 inch.

  • Approximately 750 seeds per ounce
  • Sowing Rate: 1 ounce per 100 square feet
  • Depth: 1/4 - 1/2 inch
Silphium Seeds | Compass Plant

Flower Specifications

  • Moisture: Keep seeds moist until germination
  • Average Germ Time: 14 - 21 days
  • Plant Spacing: 18 - 30 inches
  • Height: 48 - 100 inches
  • USDA Zones: 3 - 9
  • Season: Perennial

Planting Directions

TEMPERATURE

24 to 39F for 4 - 8 weeks, then moved to 68F for germination

AVERAGE GERM TIME

21 - 28 days after cold period

LIGHT REQUIRED

Yes

DEPTH

1/8 - 1/4 inch

SOWING RATE

1 ounce per 250 square feet

MOISTURE

Keep seeds moist until germination

PLANT SPACING

15 - 18 inches

CARE & MAINTENANCE

Silphium

Videos

HOW ITS MADE