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Eryngium × oliverianum

Sea holly

Garden

Wishlist

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Features

  • BloomsAugust to October
  • Height0.4m to 1.1m
  • Spread0.4m to 0.65m
  • Growth HabitClump
  • Flower ColourBlue-mauve
  • Leaf ColourMedium green
  • AwardsRHS Garden Merit

Description

Eryngium × oliverianum (Sea holly). This upright perennial grows to a height of 1m and a spread of 65cm. Bears umbels of purple-blue globose flowerheads in late summer with stiff, steely blue bracts. The leaves are jagged, mid-green and heart-shaped. Plants tend to collapse in wet, heavy ground during winter.

Characteristics

Perennial, Deciduous or Evergreen, Shrub or Herbaceous

Origin

Europe, N.Africa, Asia & S. America

Interest and use

Walls, rock garden.

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Needs

  • LightFull sun
  • HardinessHardy (min -10°C)
  • SoilWell drained, Fertile, Chalky
  • WaterDry

Cultivation

They are fully to half hardy. Grow in sun with fertile well drained soil.

Propagation

Propagate species from fresh seed; selected forms by root cuttings in winter or by division in spring.

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