Silver Sea Holly – Seeds

(Eryngium planum)

Silver Sea Holly is a striking perennial known for its spiky, steel-blue flowers and silvery foliage. Its architectural form adds texture and drama to borders, rockeries, and perennial beds. Long-lasting and drought-tolerant, it also attracts bees and butterflies, making it perfect for pollinator-friendly gardens.

Why Grow Silver Sea Holly?

• Unique spiky, steel-blue flowers with silvery foliage

• Hardy, drought-tolerant perennial

• Long-lasting blooms ideal for cutting

• Attracts bees and butterflies

Key Features

• Type: Perennial

• Height: 60–90 cm

• Flowers: Summer

• Position: Full sun

• Soil: Well-drained, moderately fertile

Ideal For

• Cottage and mixed borders

• Rockeries and perennial beds

• Pollinator-friendly gardens

• Cutting for floral arrangements

Sowing & Growing

• Sow indoors: February–April in seed trays

• Sow outdoors: April–May directly in prepared soil

• Germination: 14–28 days at 18–20°C

• Spacing: 30–40 cm between plants

• Care: Low maintenance; drought-tolerant once established