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Geranium psilostemon AGM

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© RHS 2000

Characteristics

Plant type

Herbaceous Perennial

Habit

Clump-forming

Resilience

Hardiness

H7 (very hardy)

Colour

Flower

Black, Purple and Red in Summer

Foliage

Green in Spring and Summer
Red in Autumn

Size

Ultimate height

0.5-1 metres

Ultimate spread

0.1-0.5 metres

Time to ultimate height

2-5 years


Preferred common name

Armenian cranesbill

Family

Geraniaceae


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

G. psilostemon is an herbaceous perennial forming a large clump of lobed leaves, tinted red in autumn. Flowers 4cm in width, magenta-crimson with black centres, on upright stems to 1.2m

Synonym(s)

  • Geranium armenum

How to grow

Sunlight

  • Full sun
  • Part shade

Aspect

  • South-facing, East-facing, West-facing or North-facing
  • Exposed or Sheltered

Cultivation

Grow in any, moderately fertile soil apart from waterlogged soils. Full sun or partial shade is best but shade is tolerated. Quite a tall species so may need support to prevent it flopping

Soil

  • Moist but well-drained or Well-drained
  • Acid, Alkaline or Neutral
  • Chalk, Loam, Sand or Clay

Propagation

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

Suggested planting locations and garden types

Banks and Slopes, City/Courtyard Gardens, Cottage/Informal Garden, Flower borders and beds, Ground Cover, Low Maintenance, Patio/Container Plants, Underplanting of Roses and Shrubs or Wildlife Gardens


How to care

Pruning

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

Pests

May be attacked by vine weevil, sawflies, slugs and snails

Diseases

May be subject to powdery mildews, a downy mildew and a virus