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Herbaceous Perennial

Eryngium eburneum
  • RHS Plants for pollinators

yellow-tinged ivory white sea holly

E. eburneum is a clump-forming, evergreen perennial with a basal rosette of spiny-toothed leaves up to 1m long. In late summer, pale green, arching, branched stems bear greenish-white, rounded flower clusters with small, spiny bracts

Synonyms
Eryngium horridum misapplied
Eryngium bromeliifolium misapplied
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Size
Ultimate height
1–1.5 metres
Time to ultimate height
2–5 years
Ultimate spread
0.5–1 metres
Growing conditions
Chalk
Clay
Loam
Sand
Moisture
Moist but well–drained
pH
Acid, Alkaline, Neutral
Colour & scent
StemFlowerFoliageFruit
Spring Green
Summer Green White Green
Autumn Green
Winter Green
Position
  • Full sun
Aspect

West–facing or South–facing

Exposure
Exposed or Sheltered
Hardiness
H4
Botanical details
Family
Apiaceae
Native to the UK
No
Foliage
Evergreen
Habit
Bushy
Genus

Eryngium can be annuals, biennials or perennials with simple or divided leaves, often spiny edged, and cone-like flower-heads often surrounded by an involucre of conspicuous spiny bracts

Name status

Correct

Plant range
South America

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How to grow

Cultivation

Grow in moist but well-drained, fertile soil in full sun. Protect from winter wet

Propagation

Propagate by seed or division

Suggested planting locations and garden types
  • Coastal
  • Cottage and informal garden
  • City and courtyard gardens
  • Flower borders and beds
Pruning

Cut back after flowering

Pests

Slugs and snails may be troublesome

Diseases

May be subject to powdery mildews

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