Geranium pratense 'Plenum Caeruleum' (d)

RHS Plant Profile

meadow cranesbill 'Plenum Caeruleum'

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Herbaceous Perennial

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A clump-forming perennial to around 70cm high, with finely divided soft green leaves. Double lavender-blue flowers, sometimes flushed rosy pink in the centres, are produced in late spring and early summer

Position

Full sun, Partial shade

Soil Types

Clay, Loam

Max Height

0.5-1 metres

Max Spread

0.1-0.5 metres

Size

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

Growing Conditions

Clay Loam

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

Position

Full sun Partial shade

Aspect: East–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: Geraniaceae
Native to GB/Ireland: No
Foliage: Deciduous
Habit: Clump forming
Genus: Geranium can be annuals, biennials and perennials, herbaceous or evergreen, with rounded, usually palmately lobed or divided leaves, and lax inflorescences of rounded, 5-petalled flowers
Name Status: Accepted

How to Grow

Cultivation

Grow in rich, well-drained soil in sun or light shade. Keep watered in dry summers. Divide every 2-3 years to maintain vigour

Propagation

Propagate by division or by basal softwood cuttings in spring

Suggested planting locations and garden types

Coastal
Cottage and informal garden
Wildlife gardens
Flower borders and beds
Ground cover
Underplanting of roses and shrubs

Pruning

Remove flowered stems and old leaves to encourage the production of fresh leaves and flowers

Pests

May be susceptible to vine weevil, geranium sawfly, slugs and snails

Diseases

May be susceptible to powdery mildews, downy mildews, rust diseases and virus diseases