Geranium himalayense 'Plenum' (d)

RHS Plant Profile
Himalayan cranesbill 'Plenum'

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Himalayan cranesbill 'Plenum' RHS
Himalayan cranesbill 'Plenum' visionspictures.com
Himalayan cranesbill 'Plenum' visionspictures.com

Synonyms

Geranium 'Birch Lilac'
Geranium himalayense 'Birch Double'
Geranium himalayense double form
Geranium grandiflorum double form

Herbaceous Perennial
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'Plenum' is smaller in stature than the species itself and bears double blue-purple flowers in summer, set against rounded leaves

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 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)
H7

Colour & Scent

Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family
Geraniaceae
Native to GB/Ireland
No
Foliage
Deciduous
Habit
Bushy
Potentially harmful
Harmful if eaten. Wear gloves and other protective equipment when handling. Pets: Harmful if eaten. For further information and contact numbers regarding pets, see the HTA guide to potentially harmful plants
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 any, moderately fertile soil apart from waterlogged soils in full sun or partial shade

Propagation

Propagate by division in spring or propagate by softwood basal cuttings in early to mid spring and root with bottom heat

Suggested planting locations and garden types

  • Gravel garden
  • Cottage and informal garden
  • Ground cover
  • Underplanting of roses and shrubs
  • Flower borders and beds

Pruning

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

Pests

May be susceptible to vine weevil, capsid bug and sawflies

Diseases

May be susceptible to downy mildews and powdery mildews