Add striking color and architectural beauty to your garden with Blue Sea Holly Seeds (Eryngium planum). This unique perennial flower is admired for its metallic blue flower heads, spiky blooms, and silvery-blue foliage that create a dramatic coastal-inspired look in landscapes.

Also known as Flat Sea Holly, this hardy ornamental plant produces globe-shaped blue flowers surrounded by spiny bracts, making it a standout feature in borders, rock gardens, cottage gardens, and drought-tolerant landscapes.

Blue Sea Holly is highly valued by gardeners and florists for its unusual appearance, long-lasting blooms, and excellent performance as a cut flower. Its nectar-rich flowers also attract bees and butterflies, making it a beautiful addition to pollinator-friendly gardens.

Plant Details

• Botanical Name: Eryngium planum
• Common Name: Blue Sea Holly, Flat Sea Holly
• Plant Type: Perennial Flower
• Bloom Color: Metallic Blue
• Foliage: Silvery Blue-Green Leaves
• Plant Height: 18–36 inches
• Light Requirements: Full Sun
• Soil: Dry, well-draining soil
• Bloom Season: Summer
• Uses: Borders, rock gardens, cut flowers, dried arrangements, pollinator gardens

Why Grow Blue Sea Holly Seeds?

• Rare Blue Blooms: Produces stunning metallic blue flower heads unlike most garden flowers.
• Architectural Beauty: Adds unique shape, texture, and structure to landscapes.
• Excellent Cut Flower: Perfect for fresh and dried floral arrangements.
• Pollinator Friendly: Attracts bees, butterflies, and beneficial insects.
• Drought Tolerant: Thrives in sunny, dry garden conditions once established.

Growing Tips

• Seeds benefit from cold stratification before planting to improve germination.
• Sow seeds outdoors in fall or start indoors with a cold treatment.
• Plant seeds in well-draining soil and avoid overly wet conditions.
• Provide full sun for the strongest blue coloration.
• Space plants 12–18 inches apart for healthy growth.
• Allow flowers to dry naturally on the plant for decorative arrangements.

Germination: Can take several weeks to months depending on conditions.
Bloom Time: Summer after establishment.

❓ Frequently Asked Questions (FAQ)

Is Blue Sea Holly a perennial?
Yes. Blue Sea Holly is a hardy perennial that returns year after year in suitable growing conditions.

Does Sea Holly need full sun?
Yes. Full sun helps develop stronger plants and the most vibrant blue coloration.

Can Blue Sea Holly grow in poor soil?
Yes. It prefers dry, well-draining soil and performs well in challenging garden conditions.

Are Blue Sea Holly flowers good for cutting?
Yes. The unique blooms are excellent for both fresh and dried flower arrangements.

Where to Buy Blue Sea Holly Seeds for Sale?
At Seeds World, we offer fresh Blue Sea Holly Seeds (Eryngium planum) with fast U.S. shipping. Grow this unique blue perennial flower perfect for gardens, floral arrangements, and pollinator-friendly landscapes.

Pros and cons

• Flowering
• Drought resistant
• Attracts pollinators