Caryopteris × clandonensis Petit Bleu ('Minbleu'PBR)

RHS Plant Profile
bluebeard [Petit Bleu]

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Synonyms

Caryopteris × clandonensis 'Minbleu'PBR
Caryopteris incana Petit Bleu

Plants for pollinators
Shrubs

A compact, spreading, deciduous shrub to 60cm, with slender, ovate, grey-green leaves to 5cm long, silver-hairy beneath. In late summer and autumn it bears small, deep blue flowers in clusters along the stems. A good plant for pollinating insects

Position

Full sun

Soil Types

Chalk, Loam, Sand

Max Height

0.5-1 metres

Max Spread

1-1.5 metres

Size

Time to Maturity
2–5 years
Max Spread
1-1.5 metres
Max Height
0.5-1 metres

Growing Conditions

Chalk Loam Sand
Moisture
Moist but well–drained
pH
Acid or Alkaline or Neutral

Position

Full sun
Aspect
East–facing or South–facing or West–facing
Exposure
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)
H4

Colour & Scent

Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family
Lamiaceae
Native to GB/Ireland
No
Foliage
Deciduous
Habit
Bushy
Genus
Caryopteris can be deciduous shrubs or perennials, with aromatic, simple leaves and small blue or white flowers in compact axillary clusters in late summer and autumn
Name Status
Trade

How to Grow

Cultivation

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

Propagation

Propagate by seed sown in a cold frame in autumn; root softwood cuttings in late spring or greenwood cuttings in early summer

Suggested planting locations and garden types

  • City and courtyard gardens
  • Cottage and informal garden
  • Wildlife gardens
  • Coastal
  • Mediterranean climate plants
  • Low Maintenance
  • Flower borders and beds

Pruning

See pruning group 6

Pests

May be susceptible to capsid bugs

Diseases

May be susceptible to honey fungus