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    AGM plants have been through a rigorous trial and assessment programme. They are:

    • Excellent for ordinary use in appropriate conditions
    • Available to buy
    • Of good constitution
    • Essentially stable in form & colour
    • Reasonably resistant to pests & diseases
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Callistemon citrinus 'Splendens'

crimson bottlebrush 'Splendens'

AGM plants

AGM plants have been through a rigorous trial and assessment programme. They are:

  • Excellent for ordinary use in appropriate conditions
  • Available to buy
  • Of good constitution
  • Essentially stable in form & colour
  • Reasonably resistant to pests & diseases
© RHS 2002
Sold by 34 nurseries

  • Other common names crimson bottlebrush 'Splendens'

  • Synonyms Callistemon 'Splendens'

  • Family Myrtaceae

  • Genus Callistemon are evergreen shrubs with aromatic, linear to lance-shaped leaves and bottlebrush-like spikes of flowers in which the long colourful stamens are prominent

  • Details 'Splendens' is a lax medium-sized evergreen shrub with slender arching branches clothed with narrow, rather stiff leaves, and bearing bright crimson bottlebrush-like flower spikes 15cm in length near the shoot tips

Characteristics

  • Foliage Evergreen

  • Habit Bushy

  • Fragrance Leaf

  • 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

Sunlight

  • Full Sun

  • Aspect South-facing or West-facing

  • Exposure Sheltered

Soil

  • Loam

    Loam

  • Clay

    Clay

  • Sand

    Sand

  • MoistureMoist but well-drained

  • SoilLoam, Clay, Sand

  • pHAcid, Neutral

Size

  • Ultimate height 4-8 metres

  • Ultimate spread 2.5-4 metres

  • Time to ultimate height 10-20 years

How to grow

Cultivation Grow in a sheltered position in full sun with a moist but well-drained soil

Propagation Propagate by seed or from semi-hardwood cuttings

Suggested planting locations and garden types Wall-side Borders City & Courtyard Gardens Mediterranean Climate Plants Patio & Container Plants

How to care

Pruning Pruning group 8

Pests Can get glasshouse red spider mite, mealybugs and scale insects under glass

Diseases Generally disease free

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