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Geranium 'Johnson's Blue'

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© RHS 2002

Characteristics

Plant type

Herbaceous Perennial

Habit

Clump-forming

Resilience

Hardiness

old H4 (hardy)

Colour

Flower

Blue in Summer

Foliage

Green in Spring and Summer

Size

Ultimate height

0.1-0.5 metres

Ultimate spread

0.5-1 metres

Time to ultimate height

2-5 years


Preferred common name

geranium 'Johnson's Blue'

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

'Johnson's Blue' is a clump-forming rhizomatous perennial to 30cm, with deeply lobed leaves and long-stalked flowers 5cm in width, with rounded, dark-veined, lavender-blue petals

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

Soil

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

Cottage/Informal Garden, Flower borders and beds, Ground Cover, Underplanting of Roses and Shrubs or Low Maintenance


How to care

Pruning

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

Pests

Can get vine weevil, capsid bug and sawflies

Diseases

May be affected by a downy mildew and powdery mildews