Eryngium Giganteum Seeds - Flower Plant

Eryngium Giganteum Seeds produce a hardy perennial plant known for its striking, spiky, metallic blue flower heads and silvery-gray, thistle-like foliage. This clump-forming plant thrives in full sun with well-drained soil and is suitable for garden borders, rock gardens, and naturalized landscapes. Once established, Sea Holly is drought-tolerant and adds texture, long-lasting color, and ornamental interest while attracting pollinators such as bees and butterflies.

Features

• Clump-forming perennial growth habit

• Produces spiky, metallic blue flower heads with silvery-gray foliage

• Suitable for garden borders, rock gardens, and naturalized landscapes

• Thrives in full sun with well-drained soil

• Drought-tolerant once established

• Attracts pollinators and adds long-lasting texture

Specifications

• Scientific name: Eryngium giganteum

• Common name (US): Sea Holly

• Seed type / variety: Perennial flowering variety

• Growth habit: Clump-forming perennial

• USDA zones: 4 to 9

• Planting season: Spring

• Growing season: Late spring through summer

• Sowing Season: Spring

• Sowing season months: March to May

• Germination time and conditions: 14 to 28 days; cold stratification improves germination

• Sunlight requirements: Full sun

• Soil requirements: Well-drained, sandy or loamy soil

• Watering needs: Low; drought-tolerant once established

• Mature plant size: 2 to 3 feet tall; 1 to 2 feet spread

• Plant spacing: 12 to 18 inches apart