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A picture of a Sea Holly

Sea Holly

Eryngium spp.

Also known as

Eryngo, Amethyst Sea Holly, Eringoe, Sea holly

Eryngium July 2011-1 by Alvesgaspar (CC BY-SA 3.0)

Full Sun
Moderate watering
Half-hardy

H3

RHS hardiness

-5°C

Minimum temperature

Expected size

Height
Spread

Max

Min

Flowering

  • spring
  • summer
  • autumn
  • winter

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

The genus Eryngium contains around 241 biennial and perennials, with some evergreen species, also called eryngo, amethyst sea holly and sea holly. These are typically grown for their flowers and foliage and originate from dry, rocky habitats. They possess long tap or fibrous roots and oval to heart-shaped, sometimes divided foliage. Foliage is spiny and may be silvery in colour, ranging to white or blue-green. Flowers resemble thistles and are white or blue, surrounded by showy, spikey modified leaves known as bracts. This genus contains popular ornamental species and many hybrids have been produced for garden use.

How to propagate Sea Holly

Seed

Division

Selected forms by division in the spring.

Cuttings

Root cuttings in winter.

Special features of Sea Holly

Attractive flowers

Attractive leaves

Attracts useful insects

Other uses of Sea Holly

Grown for their flowers, foliage and habit. Suitable for coastal conditions.

Purple Flowering Summer Plants

A photo of Aconite

Aconite

Aconitum spp.

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