Sea Holly Seeds - Flower Plant

Sea Holly is a hardy ornamental perennial admired for its striking metallic-blue flower heads, spiny bracts, and attractive silvery-blue foliage. Blooming from mid to late summer, it adds dramatic texture and color to borders, rock gardens, coastal landscapes, xeriscapes, and pollinator gardens. The long-lasting blooms are excellent for both fresh and dried floral arrangements. Thriving in full sun with well-drained soil, Sea Holly is drought tolerant once established and requires minimal maintenance.

Features

• Produces striking metallic-blue flower heads
• Attractive silvery-blue foliage and architectural form
• Excellent for borders, rock gardens, and coastal landscapes
• Ideal for fresh and dried flower arrangements
• Attracts bees, butterflies, and other beneficial pollinators
• Drought tolerant and low maintenance
• Long-lasting summer blooms

Specifications

• Scientific Name: Eryngium planum
• Common Name (US): 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 to improve germination
• Sunlight Requirements: Full sun
• Soil Requirements: Well-drained sandy, gravelly, or loamy soil; tolerant of poor, 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