London (change)
Today 22°C / 16°C
Tomorrow 26°C / 16°C

Eryngium planum

Sea Holly

Reader rating

From 3 ratings

+ Add a review

Key information

Plant type

Hardy perennial

Flower colour



Attractive seed-heads, Flowers



Skill level


photo by Dianna Jazwinski, copyright GAP Photos (39516)

Plant details

This attractive sea holly forms clumps of evergreen, soft, deep green heart-shaped leaves. In early summer, the thin wirey stems emerge, set with spiny leaves. The branched stems carry a profusion of small, sea holly flowers in bright, steely blue. This plant prefers full sun and well-drained soil.

Family: Apiaceae

Genus: Eryngium

Species: planum

Plant type: Hardy perennial

Flower colour: Blue

Foliage colour: Mid-green

Feature: Attractive seed-heads, Flowers

Sun exposure: Full sun

Soil: Well-drained/light, Moist, Sandy

Hardiness: Hardy

Skill level: Beginner

Height: 90cm

Spread: 45cm

Time to plant seeds: September to October

Time to divide plants: March to March

Flowering period: July to September

Reader reviews


The feature on the Sea Holly is good, I have tried for 2 year now to grow it from seed with no success at all, which is a bit worrying as I am having a lot of success with everything else although I am only learning and new to all this. So I am really disappointed that It didn't grow again, any suggestions for me. I'm determined to get it to grow.

Hope you can help me
Catherine Smart


This plant is superb it is a fabulous bee loving plant that is coverd in them all day.


Buy a young plant from a nursery (not Garden Centre exspensive) You will be surprised how quickly it will spread

Add your own review

Please register or login to add a review