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A picture of a Sea Holly

Sea Holly

Eryngium maritimum

Also known as

Sea holly, Sea eryngium

Eryngium maritimum MichaD 1 by Michael Apel (CC BY-SA 3.0)

Full Sun
Easy care
Light watering
Frost Hardy


USDA zone


Minimum temperature

Expected size








5 years to reach maturity


  • spring
  • summer
  • autumn
  • winter

This plant has no fragrance

More images of Sea Holly

A photo of Sea Holly
A photo of Sea Holly
A photo of Sea Holly
A photo of Sea Holly
A photo of Sea Holly

Sea Holly Overview

This evergreen perennial sea holly forms a lovely mound from which upright to decumbent stems bearing stiff, spiny, blue- to grey-green leaves appear. From summer into autumn it produces cone-like, blue flowers which can be cut for floral arrangements or left to provide winter interest. The blue colour can intensify with cold weather. This species can be used to create decorative borders, beds, pot plants, containers and landscapes. Be aware, they can overgrow and invade areas quickly, and with every little root that stays behind in the soil growing into a new plant, they are tricky to remove from an area!

How to harvest Sea Holly

Generally not harvested.

How to propagate Sea Holly


Clumps in autumn




Special features of Sea Holly

Attractive flowers

Attracts useful insects

Autumn colour

Other uses of Sea Holly

Wildflower/meadow Summer/Autumn interest. Suitable for coastal conditions.


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