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Ceratostigma willmottianum AGM

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© RHS 2002

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

1-1.5 metres

Time to ultimate height

5-10 years


Preferred common name

Chinese plumbago

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

C. willmottianum is a small deciduous shrub with lanceolate leaves to 5cm in length, turning red in autumn. Flowers 2.5cm in width, rich blue, in dense terminal clusters

Other common names

  • hardy plumbago

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
  • Chalk, Clay, Sand or Loam

Propagation

Propagate by semi-hardwood cuttings

Suggested planting locations and garden types

Banks and Slopes, City/Courtyard Gardens, Cottage/Informal Garden, Cut Flowers, Flower borders and beds, Gravel Garden, Low Maintenance, Mediterranean Climate Plants or Patio/Container Plants


How to care

Pests

Generally pest free

Diseases

May suffer from powdery mildews