Prunella grandiflora 'Alba'

RHS Plant Profile

large selfheal 'Alba'

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Synonyms

Prunella grandiflora var. alba

Herbaceous Perennial

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A spreading, semi-evergreen perennial to 15cm tall, grown for its tubular, white flowers carried in whorls on leafy stems in summer. Grow as groundcover on a bank or in a wild garden, where the flowers attract pollinating insects

Position

Full sun, Partial shade

Soil Types

Chalk, Clay, Loam, Sand

Max Height

0.1-0.5 metres

Max Spread

0.5-1 metres

Size

Time to Maturity: 2–5 years
Max Spread: 0.5-1 metres
Max Height: 0.1-0.5 metres

Growing Conditions

Chalk Clay Loam Sand

Moisture: Moist but well–drained
pH: Acid or Alkaline or Neutral

Position

Full sun Partial shade

Aspect: East–facing or North–facing or South–facing or West–facing
Exposure: Exposed or 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): H7

Colour & Scent

Season	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family: Lamiaceae
Native to GB/Ireland: No
Foliage: Deciduous, Semi evergreen
Habit: Matforming
Genus: Prunella are semi-evergreen perennials of spreading habit, the prostrate stems rooting at the nodes, with dense, short spikes of small, 2-lipped flowers
Name Status: Accepted

How to Grow

Cultivation

Grow in any moist but well-drained, moderately fertile soil in sun or partial shade

Propagation

Propagate by division in spring or autumn

Suggested planting locations and garden types

Wildlife gardens
Banks and slopes
Flower borders and beds
Ground cover
Underplanting of roses and shrubs

Pruning

Clip back after flowering to maintain a compact shape

Pests

May be susceptible to slugs and snails

Diseases

Generally disease-free