Eryngium Planum Seeds - Flower Plant

Eryngium planum, commonly known as Blue Sea Holly, is a hardy ornamental perennial prized for its brilliant metallic-blue flower heads, spiny blue bracts, and attractive silvery-green foliage. Blooming from mid to late summer, this drought-tolerant plant adds bold texture and architectural interest to borders, cottage gardens, rock gardens, coastal landscapes, and pollinator gardens. Its long-lasting blooms are excellent for fresh and dried floral arrangements and attract bees, butterflies, and other beneficial pollinators.

Features

• Produces striking metallic-blue flower heads
• Attractive silvery-green foliage with blue stems
• Excellent for borders, rock gardens, and coastal landscapes
• Outstanding for fresh and dried flower arrangements
• Attracts bees, butterflies, and other beneficial pollinators
• Drought tolerant and low maintenance once established
• Adds unique architectural interest to ornamental gardens

Specifications

• Scientific Name: Eryngium planum
• Common Name (US): Blue 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