Sea Holly
Eryngium maritimum
Also known as
Seaside Eryngo, Eryngo, Maritime Eryngo, Seaside Coyote-Thistle, Sea holly, Sea eryngium
Eryngium maritimum MichaD 1 by Michael Apel (CC BY-SA 3.0)
Full Sun
Easy care
Light watering
Frost Hardy
H7-H4
RHS hardiness
-20°C
Minimum temperature
Expected size
Height | Spread | |
|---|---|---|
50cm | Max | 50cm |
10cm | Min | 10cm |
5 years to reach maturity
Flowering
-
spring
-
summer
-
autumn
-
winter
This plant has no fragrance
More images of Sea Holly
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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
Division
Clumps in autumn
Cuttings
Root
Seed
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.