08/10/2026
6 x Sea Holly (Eryngium), £7.50
(6 for the price of 5)
Perfect for autumn planting to establish roots in warmer soil before next spring.
Sea holly (Eryngium) is a striking genus of over 250 species of architectural, thistle-like perennials featuring spiny, silvery-blue foliage and metallic, cone-shaped flower heads surrounded by spiky bracts. Despite its common name and prickly leaves, it belongs to the carrot and parsley family (Apiaceae) rather than the true holly or thistle families.
Plant Characteristics & Types
• Appearance: Features metallic blue, silver, or purple-tinted flower spikes that bloom from midsummer to autumn.
• Foliage: Leathery, spiky, and often marbled with white or silver veins.
Growing and Care Requirements
• Sunlight: Requires full, all-day sun to develop its intense, vibrant blue coloration.
• Soil: Needs sharp, free-draining, or sandy soil; it heavily dislikes winter wetness, which can rot the root crown.
• Watering: Highly drought-tolerant once established due to a deep taproot; avoid overwatering.
• Maintenance: Low-maintenance; leave dead flower heads over winter for architectural silhouettes, then trim back old stems in the spring