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  • AGM plants

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

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    • Available to buy
    • Of good constitution
    • Essentially stable in form & colour
    • Reasonably resistant to pests & diseases
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Buddleja davidii Nanho Purple = 'Monum'

butterfly bush [Nanho Purple]

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
butterfly bush [Nanho Purple]

© RHS

18 suppliers

  • Other common names butterfly bush [Nanho Purple]

  • Family Scrophulariaceae

  • Genus Buddleja can be evergreen or deciduous shrubs, occasionally trees or scrambling climbers with simple leaves and panicles of small, tubular fragrant flowers

  • Details 'Nanho Purple' is a compact shrub with lance-shaped leaves and fragrant, light purple flowers in dense cylindrical panicles in summer and autumn

Characteristics

  • Foliage Deciduous

  • Habit Bushy

  • Fragrance Flower

  • 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)

    H6

Colour

Sunlight

  • Full Sun

  • Aspect South-facing or West-facing

  • Exposure Exposed or Sheltered

Soil

  • Sand

    Sand

  • Chalk

    Chalk

  • Loam

    Loam

  • MoistureWell-drained

  • SoilSand, Chalk, Loam

  • pHAcid, Alkaline, Neutral

Size

  • Ultimate height 1.5-2.5 metres

  • Ultimate spread 1.5-2.5 metres

  • Time to ultimate height 2-5 years

How to grow

Cultivation Grow in fertile well drained soil in full sun

Propagation softwood cuttings in summer and hardwood cuttings in autumn

Suggested planting locations and garden types Flower borders and beds City & Courtyard Gardens Coastal Wildlife Gardens

How to care

Pruning Prune annually in early spring back to a low framework, pruning group 6

Pests Susceptible to capsid bug, figwort weevil, mullein moth and glasshouse red spider mite

Diseases generally trouble free

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