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Ceratostigma plumbaginoides AGM

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© RHS 1997

Characteristics

Plant type

Herbaceous Perennial

Habit

Clump-forming

Resilience

Hardiness

H4 (hardy - average winter)

Colour

Flower

Blue in Autumn and Summer

Foliage

Green in Spring and Summer
Purple and Red in Autumn

Size

Ultimate height

0.1-0.5 metres

Ultimate spread

0.1-0.5 metres

Time to ultimate height

2-5 years


Preferred common name

hardy blue-flowered leadwort

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. plumbaginoides is a low-growing herbaceous perennial with spreading roots, forming a mat of stems bearing oval leaves which turn red or purple in autumn. Clusters of rich blue flowers from late summer

Other common names

  • blue ceratostigma

Synonym(s)

  • Ceratostigma larpentiae
  • Plumbago larpentiae

How to grow

Sunlight

  • Full sun

Aspect

  • South-facing or East-facing
  • Sheltered

Cultivation

Grow in moderately fertile, moist but well-drained soil in full sun

Soil

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

Propagation

Propagate by rooting softwood cuttings in spring or propagate by semi-hardwood cuttings in summer

Suggested planting locations and garden types

Banks and Slopes, City/Courtyard Gardens, Cottage/Informal Garden, Flower borders and beds, Mediterranean Climate Plants or Wall-side Borders


How to care

Pruning

Cut back to ground level any shoots that get frost damaged

Pests

Generally pest free

Diseases

May be subject to powdery mildews