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Ceratostigma willmottianum Forest Blue 'Lice' PBR AGM

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© RHS

Characteristics

Plant type

Shrub

Habit

Bushy

Resilience

Hardiness

H4 (hardy - average winter)

Colour

Flower

Blue in Autumn and Summer

Foliage

Green in Spring and Summer
Red in Autumn

Size

Ultimate height

0.5-1 metres

Ultimate spread

0.5-1 metres

Time to ultimate height

5-10 years


Preferred common name

Chinese plumbago [Forest Blue]

Family

Plumbaginaceae


Ceratostigma can be evergreen or deciduous shrubs or herbaceous perennials, with simple leaves which usually colour well in autumn, and short terminal or axillary spikes of salver-shaped blue flowers in late summer and autumn

Forest Blue is a bushy, spreading deciduous shrub to 60cm tall, with lance-shaped leaves turning red in autumn, and small clusters of rich blue, plumbago-like flowers 2cm wide in late summer and autumn

How to grow

Sunlight

  • Full sun
  • Part shade

Aspect

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

Cultivation

Grow in well-drained soil in sun or partial shade

Soil

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

Propagation

Propagate by semi-hardwood cuttings

Suggested planting locations and garden types

City/Courtyard Gardens, Coastal, Cottage/Informal Garden, Garden Edging, Flower borders and beds, Wall-side Borders or Patio/Container Plants


How to care

Pests

Generally pest free

Diseases

May suffer from powdery mildews