Drought Tolerant Eryngium Alpinum Sea Holly Garden Flower Plant Seed

Eryngium Seeds - Alpinum

Flower Specifications

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

Planting Directions

Temperature: 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

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

Care & Maintenance: Eryngium

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.

Perfect for cutting

The summer-blooming blossoms, which are actually soft-to-the-touch, harden to long-lasting cut flowers that are perfect for drying and preserving.

alpinum eryngium flowers

Eryngium seed | alpinum

How to grow

How To Grow Sea Holly Alpinum From Seed: Alpine Sea Holly will grow from flower seeds in partial shade, but prefers full sun. It is a deciduous, tap-rooted perennial that dislikes root disturbances, so it is best to start Eryngium seeds directly outdoors.

Sow seeds in the spring after frost season has passed. Surface sow Eryngium seeds and then tightly press into the soil. Seeds must be kept moist until germination begins.

  • Sowing Rate: 4 - 5 seeds per plant
  • Average Germ Time: 28 - 56 days
  • Keep moist until germination
  • Attracts bees and butterflies
  • Depth: Surface sow seed and tightly press in to soil
sea holly seeds alpinum

Flower Specifications

An elegant species for the herbaceous border, Eryngium Sea Holly is perfect for exciting displays and for cutting. Eryngium plants have a long season of visual interest, even to the winter garden. Sea Holly can withstand severe frosts and is a tough plant for full sun in well drained, light soils.

  • Height: 28 inches
  • USDA Zones: 4 - 9
  • Season: Perennial
  • Deer Resistant: Yes
  • Drought Tolerant: Yes