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Buddleja alternifolia AGM

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© RHS 1989

Characteristics

Plant type

Shrub

Habit

Bushy

Fragrance

Flower

Resilience

Hardiness

H5 (hardy - cold winter)

Colour

Flower

Purple in Summer

Foliage

Green and Grey/Silver in Autumn, Spring and Summer

Size

Ultimate height

2.5-4 metres

Ultimate spread

2.5-4 metres

Time to ultimate height

10-20 years


Preferred common name

alternate-leaved butterfly bush

Family

Scrophulariaceae


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

B. alternifolia is a vigorous large deciduous shrub which can be trained into a small tree, with arching branches bearing narrow, grey-green leaves and sweetly scented lilac-purple flowers, borne in clusters along the previous year's shoots

How to grow

Sunlight

  • Full sun
  • Part shade

Aspect

  • South-facing, West-facing or East-facing
  • Exposed or Sheltered

Cultivation

Buddleja perform best when grown in a sunny, well-drained situation

Soil

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

Propagation

Propagate by semi-hardwood cuttings

Suggested planting locations and garden types

Cottage/Informal Garden, Flower borders and beds or Wall-side Borders


How to care

Pruning

Pruning group 2

Pests

Foliage may be damaged by capsid bug and caterpillars

Diseases

May suffer from a virus