Prunella 'Blue Pearl'

RHS Plant Profile

selfheal 'Blue Pearl'

RHS

Synonyms

Prunella grandiflora 'Blue Pearl'
Prunella vulgaris 'Blue Pearl'

Herbaceous Perennial

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A spreading perennial to 30cm, with rooting stems bearing oblong or ovate leaves and short, erect spikes of deep violet-blue, tubular flowers in summer and early autumn

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 or Poorly–drained or Well–drained
pH: Acid or Alkaline or Neutral

Position

Full sun Partial shade

Aspect: South–facing or North–facing or West–facing or East–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): H6

Colour & Scent

Season	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family: Lamiaceae
Native to GB/Ireland: No
Foliage: 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: Unresolved

How to Grow

Cultivation

Easy to grow plant for any soil in full sun or partial shade. May be considered invasive. Attract bees and other beneficial insects. Good ground cover

Propagation

Propagate by division

Suggested planting locations and garden types

City and courtyard gardens
Wildlife gardens
Cottage and informal garden
Patio and container plants
Banks and slopes
Flower borders and beds
Underplanting of roses and shrubs

Pruning

No pruning required

Pests

Generally pest-free

Diseases

Generally disease-free