Flower

Eryngium (Sea Holly)

Eryngium planum

Metallic blue thistles with steel-cut ruffs — pollinators love them.

Sun

Full sun

Water

Low

Soil

Well-drained, sandy

Difficulty

Easy

Container

Yes

Edible part

Ornamental

Lifecycle

Perennial

Hardiness

Hardy

pollinatordroughtarchitectural

Plants well with

Where to source

Get growing in United Kingdom

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Thompson & Morgan

Stocks cold-hardy Eryngium varieties suited to London's temperate climate and well-drained soil conditions.

Crocus

Offers terracotta and container sizes ideal for Eryngium's preference for sharply-drained growing conditions.

Amazon UK

Supplies drainage tools and gravel amendments essential for preventing waterlogging in London's wet climate.