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Crambe cordifolia AGM

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© RHS 2002

Characteristics

Plant type

Herbaceous Perennial

Habit

Clump-forming

Fragrance

Flower

Resilience

Hardiness

H5 (hardy - cold winter)

Colour

Flower

White in Summer

Foliage

Dark Green in Autumn, Spring and Summer

Size

Ultimate height

1.5-2.5 metres

Ultimate spread

1-1.5 metres

Time to ultimate height

2-5 years


Preferred common name

greater sea kale

Family

Brassicaceae


Crambe are robust annuals and perennials with large, simple or divided leaves and racemes or large panicles of small, fragrant white flowers

C. cordifolia is an herbaceous perennial to 1.8m in height, with bold, dark green, lobed leaves to 30cm in width, and branched sprays of small, scented white flowers

Other common names

  • flowering sea kale
  • heart-leaved colewort

How to grow

Sunlight

  • Full sun
  • Part shade

Aspect

  • South-facing, East-facing or West-facing
  • Sheltered

Cultivation

Ideally grow in a deep, fertile, well-drained soil in full sun although it will tolerate poor soil and partial shade. Provide shelter from strong winds.

Soil

  • Well-drained
  • Acid, Alkaline or Neutral
  • Loam, Chalk or Sand

Propagation

Propagate by seed sown in pots in a cold frame in spring or autumn or propagate by division in early spring or take root cuttings in winter

Suggested planting locations and garden types

Architectural, Cottage/Informal Garden, Flower borders and beds, Cut Flowers or Wildlife Gardens


How to care

Pruning

Cut down to ground level in autumn

Pests

Can get flea beetles, slugs and caterpillars

Diseases

May suffer from club root