• Eryngium Planum (Sea Holly) with bright yellow blooms in a summer garden, showcasing silvery grey to cobalt blue thistle-like flowers and dark green leaves.
  • Sea Holly (Eryngium Planum) with vibrant blue thistle-like flowers and spiky leaves in a garden setting. Ideal for fresh and dried flower arrangements.
  • Eryngium Planum, also known as Sea Holly, with spiky thistle-like flowers in silvery grey and cobalt blue shades, surrounded by yellow blooms
  • Eryngium Planum Sea Holly with spiky leaves and thistle-like flowers in shades of silvery grey to cobalt blue in a green garden background
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Bishy Barnabees Cottage Garden

Eryngium Planum (Sea Holly)

£2.10
£2.10
Tax included.

This is such an unusual and beautiful flower. 

Spiky leaves and thistle-like flowers in beautiful shades of silvery grey through to cobalt blue.  The leaves are dark green and the stems can be silver, green or greeny-blue.  Its a fabulous one to pick for fresh flower arrangements and also dries beautifully too. 

It's full of nectar richness for the pollinators in the summer months and come winter it looks gorgeous silhouetted against the bleak, cold skies. 

Sea Holly grows well in coastal areas and gravel gardens. It likes gritty, well drained soil and full sun and is drought tolerant.

But despite being a hardy perennial it will suffer in the winter unless it's given a good straw mulch to help to keep from rotting. 

  • Seed Quantity: 150 Seeds
  • Type: Hardy Perennial
  • Genus: Erygnium Planum
  • Sow Seeds: Sow Oct-Feb or March-Sept. Sow Oct-Feb into seed trays and cover lightly with compost. Place in an unheated greenhouse. Pot on as they grow into gritty compost, Or sow Mar-Sept into seed trays as above. Place seed trays in the fridge for 2-3 weeks before bringing back out into the warmth and potting on etc as above 
  • Plant Out: When large enough plant outside 
  • Flowers: July onwards (Year 2)
  • Height & Spread: 90cm high x 40cm spread

Echinops ritro Veitch’s Blue

RHS Plants for Pollinators.

The RHS Plants for Pollinators mark is only given to plants that support pollinating insects.
    Eryngium Planum (Sea Holly) with bright yellow blooms in a summer garden, showcasing silvery grey to cobalt blue thistle-like flowers and dark green leaves.
    Sea Holly (Eryngium Planum) with vibrant blue thistle-like flowers and spiky leaves in a garden setting. Ideal for fresh and dried flower arrangements.
    Eryngium Planum, also known as Sea Holly, with spiky thistle-like flowers in silvery grey and cobalt blue shades, surrounded by yellow blooms
    Eryngium Planum Sea Holly with spiky leaves and thistle-like flowers in shades of silvery grey to cobalt blue in a green garden background