Blue Star Sea Holly Seeds - Flower Plant

Blue Star Sea Holly is a hardy ornamental perennial prized for its striking metallic-blue, star-shaped flower heads surrounded by spiny blue bracts. Blooming from mid to late summer, it adds bold texture and vibrant color to borders, cottage gardens, rock gardens, coastal landscapes, and pollinator gardens. The long-lasting blooms are excellent for fresh and dried floral arrangements, while the drought-tolerant plants thrive in full sun with well-drained soil.

Features

• Produces unique metallic-blue star-shaped flower heads
• Long-lasting blooms ideal for fresh and dried arrangements
• Excellent for borders, rock gardens, and coastal landscapes
• Attracts bees, butterflies, and other beneficial pollinators
• Drought tolerant once established
• Low-maintenance and easy to grow
• Adds architectural interest and texture to the garden

Specifications

• Scientific Name: Eryngium planum
• Common Name (US): Blue Star Sea Holly / Sea Holly
• Seed Type / Variety: Blue Flowering Perennial Variety
• Growth Habit: Upright clump-forming perennial
• USDA Zones: 4–9
• Planting Season: Spring or Fall
• Growing Season: Spring through Summer
• Sowing Season: February–April or September–October
• Germination Time and Conditions: 21–60 days at 60–70°F (16–21°C); cold stratification for 2–4 weeks is recommended for improved germination
• Sunlight Requirements: Full sun
• Soil Requirements: Well-drained sandy, gravelly, or loamy soil; tolerates poor and dry soils
• Watering Needs: Low to moderate; drought tolerant once established
• Mature Plant Size: 24–36 inches tall, 12–18 inches spread
• Plant Spacing: 12–18 inches apart