Ceratostigma willmottianum Sapphire Ring ('Lissbrill'PBR)

RHS Plant Profile
Chinese plumbago [Sapphire Ring]

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Synonyms

Ceratostigma willmottianum 'Lissbrill'PBR

Shrubs
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an open-branched deciduous medium shrub with blue flowers and autumn colour.

Position

Full sun

Soil Types

Loam, Sand

Max Height

0.5-1 metres

Max Spread

0.1-0.5 metres

Size

Time to Maturity
5–10 years
Max Spread
0.1-0.5 metres
Max Height
0.5-1 metres

Growing Conditions

Loam Sand
Moisture
Well–drained
pH
Neutral

Position

Full sun
Aspect
South–facing or West–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)
H3

Colour & Scent

Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family
Plumbaginaceae
Native to GB/Ireland
No
Foliage
Deciduous
Habit
Clump forming
Genus
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
Name Status
Trade

How to Grow

Cultivation

Grow in moderately fertile, well drained light soil in full sun.

Propagation

Propagate by softwood cutting taken in spring or semi-ripe cuttings in summer. Layering possible in autumn.

Suggested planting locations and garden types

  • Coastal
  • Cottage and informal garden
  • Gravel garden
  • Flower borders and beds
  • Banks and slopes

Pruning

Cut back shoots to within 1.5 to 2.5cm of previous years growth

Pests

Generally pest-free

Diseases

May be susceptible to honey fungus (rarely) and powdery mildews