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Herbaceous Perennial

Heuchera 'Cassis'

alum root 'Cassis'

A clump-forming perennial to about 35cm high, forming a mound of lobed, dark purple leaves that look almost black. Loose sprays of small pink flowers appear above the foliage from spring into summer

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Size
Ultimate height
0.1–0.5 metres
Time to ultimate height
2–5 years
Ultimate spread
0.1–0.5 metres
Growing conditions
Chalk
Clay
Loam
Sand
Moisture
Moist but well–drained
pH
Neutral
Colour & scent
StemFlowerFoliageFruit
Spring Pink Purple
Summer Pink Purple
Autumn Purple
Winter Purple
Position
  • Full sun
  • Partial shade
Aspect

East–facing or South–facing or West–facing

Exposure
Sheltered
Drought resistance
Yes
Hardiness
H6
Botanical details
Family
Saxifragaceae
Native to GB / Ireland
No
Foliage
Semi evergreen
Habit
Clump forming
Genus

Heuchera are more or less evergreen, clump-forming perennials with attractive, rounded, shallowly palmately lobed leaves and racemes or panicles of small, tubular flowers, often with colourful calyces

Name status

Accepted

How to grow

Cultivation

Grow in a fertile, neutral soil in sun or light shade, and ensure good drainage, especially in heavy soils. The woody rootstock tends to lift out of the ground over time, so mulch annually to retain moisture. Divide and replant every 3-4 years to maintain vigour

Propagation

Propagate by division in autumn

Suggested planting locations and garden types
  • City and courtyard gardens
  • Cottage and informal garden
  • Patio and container plants
  • Flower borders and beds
  • Garden edging
  • Ground cover
  • Underplanting of roses and shrubs
Pruning

Remove faded flower spikes

Pests

May be susceptible to leaf and bud eelworm and vine weevil

Diseases

May be susceptible to heuchera rust and leafy gall

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