• 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

Buddleja asiatica

Asian butterfly bush

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
Asian butterfly bush

© RHS

  • Other common names Asian butterfly bush

  • 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 B. asiatica is an arching, evergreen shrub with widely-spaced, dark green leaves 30cm long, felted grey on the undersides. The tiny, white flowers in long, narrow spikes are sweetly scented and appear in late winter and early spring

  • Plant range E Asia

Characteristics

  • Foliage Evergreen

  • 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)

    H3

Colour

Sunlight

  • Full Sun

  • Aspect South-facing or West-facing

  • Exposure Sheltered

Soil

  • Sand

    Sand

  • Chalk

    Chalk

  • Loam

    Loam

  • MoistureWell-drained

  • SoilSand, Chalk, Loam

  • pHAcid, Alkaline, Neutral

Size

  • Ultimate height 2.5-4 metres

  • Ultimate spread 2.5-4 metres

  • Time to ultimate height 2-5 years

How to grow

Cultivation In sheltered gardens in mild areas grow in fertile, well-drained soil in full sun. Otherwise grow in a cool greenhouse or conservatory

Propagation Root semi-ripe cuttings in summer

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

How to care

Pruning Pruning group 6, or pruning group 13 for wall-trained plants

Pests May be attacked by capsid bug, caterpillars, figwort weevils and aphids outdoors; glasshouse red spider mite and glasshouse whitefly under glass

Diseases Generally disease free

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