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Herbaceous Perennial

Eryngium × oliverianum
  • RHS AGM

Oliver eryngo

E. × oliverianum is an erect herbaceous perennial to 90cm, with strongly toothed, heart-shaped leaves and branching violet-blue stems bearing cone-like flowerheads surrounded by narrow, spiny, metallic-blue bracts

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Size
Ultimate height
0.5–1 metres
Time to ultimate height
2–5 years
Ultimate spread
0.1–0.5 metres
Growing conditions
Chalk
Loam
Sand
Moisture
Well–drained
pH
Acid, Alkaline, Neutral
Colour & scent
StemFlowerFoliageFruit
Spring Green
Summer Blue Blue Green
Autumn Blue Green
Winter
Position
  • Full sun
Aspect

South–facing or West–facing or East–facing

Exposure
Exposed
Hardiness
H5
Botanical details
Family
Apiaceae
Native to the UK
No
Foliage
Deciduous
Habit
Clump forming
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

How to grow

Cultivation

Grow in dry, well-drained soil that is poor to moderately fertile. Full sun is essential as is protection from winter wet

Propagation

Propagate by root cuttings in late winter

Suggested planting locations and garden types
  • Coastal
  • Cottage and informal garden
  • Gravel garden
  • Wildlife gardens
  • Cut flowers
  • Flower borders and beds
Pruning

Although you can cut back flower stems after flowering the seedheads are a very attractive feature so are usually left over winter

Pests

Can get leaf and bud eelworms

Diseases

May be affected by powdery mildews and root rot

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