Heuchera 'Cassis'

RHS Plant Profile

alum root 'Cassis'

Herbaceous Perennial

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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

Position

Full sun, Partial shade

Soil Types

Chalk, Clay, Loam, Sand

Max Height

0.1-0.5 metres

Max Spread

0.1-0.5 metres

Size

Time to Maturity: 2–5 years
Max Spread: 0.1-0.5 metres
Max Height: 0.1-0.5 metres

Growing Conditions

Chalk Clay Loam Sand

Moisture: Moist but well–drained
pH: Neutral

Position

Full sun Partial shade

Aspect: East–facing or South–facing or West–facing
Exposure: Sheltered
Hardiness

Hardiness Ratings

All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees C) are shown in brackets

H1A: under glass all year (>15C)
H1B: can be grown outside in the summer (10 - 15)
H1C: can be grown outside in the summer (5 - 10)
H2: tolerant of low temperatures, but not surviving being frozen (1 to 5)
H3: hardy in coastal and relatively mild parts of the UK (-5 to 1)
H4: hardy through most of the UK (-10 to -5)
H5: hardy in most places throughout the UK even in severe winters (-15 to -10)
H6: hardy in all of UK and northern Europe (-20 to -15)
H7: hardy in the severest European continental climates (< -20): H6
Drought Resistance: Yes

Colour & Scent

Season	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

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