• 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

Salix acutifolia 'Blue Streak' (m)

willow 'Blue Streak'

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
willow 'Blue Streak'

© RHS 2002

  • Other common names willow 'Blue Streak'

  • Synonyms Salix daphnoides 'Blue Streak'

  • Family Salicaceae

  • Genus Salix are deciduous shrubs and trees of diverse habit, with simple leaves and tiny flowers in catkins, male and female usually on separate plants. Some are valued for their brightly coloured winter shoots, others for their foliage or showy male catkins

  • Details 'Blue Streak' is a large deciduous shrub with purple, vividly white-bloomed stems and narrow, dark green leaves. Slender silvery catkins to 5cm in length, with yellow anthers

Characteristics

  • Foliage Deciduous

  • Habit Bushy

  • 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 North-facing or East-facing or South-facing or West-facing

  • Exposure Sheltered or Exposed

Soil

  • Loam

    Loam

  • Sand

    Sand

  • Clay

    Clay

  • MoistureWell-drained, Moist but well-drained

  • SoilLoam, Sand, Clay

  • pHAcid, Neutral, Alkaline

Size

  • Ultimate height 8-12 metres

  • Ultimate spread wider than 8 metres

  • Time to ultimate height 20-50 years

How to grow

Cultivation Grow in moderately fertile deep soil in full sun

Propagation Propagate by softwood cuttings in early summer or hardwood cuttings in winter

Suggested planting locations and garden types Low Maintenance Coastal

How to care

Pruning Pruning group 1. Can be hard pruned to rejuvenate or pollard

Pests Can get aphids, caterpillars, leaf beetles and sawflies

Diseases May be affected by willow anthracnose diseases, honey fungus and a rust

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