• 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

Clematis × cartmanii hort. 'Avalanche' (PBR) (Fo/m)

clematis 'Avalanche'

clematis 'Avalanche'

© � RHS

  • Other common names clematis 'Avalanche'

  • Synonyms Clematis AVALANCHE 'Blaaval'
    Clematiscartmanii hort. 'Blaaval'

    Clematis 'Blaaval'

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  • Genus Clematis can be deciduous or evergreen shrubs or herbaceous perennials, mostly climbing by twining leaf-stalks, and often with showy flowers. Some have attractive fluffy seed-heads in autumn

  • Family Ranunculaceae / Ranunculaceae

  • Details 'Avalanche' is a bushy trailing or scrambling evergreen non clinging climber to a maximum height of 3m, with deeply dissected glossy, leathery, deep-green leaves. Panicles of pure white flowers to 4cm across, in early to mid spring

  • Horticultural Group Forsteri Group clematis are dwarf spreading or prostrate evergreen shrubs, usually dioecious, with deeply cut, trifoliate leaves and small cream or white, sometimes fragrant, flowers


  • Foliage Evergreen

  • Habit Climbing



  • Full Sun

  • Partial Shade

  • Aspect South-facing or East-facing or North-facing

  • Exposure Sheltered or Exposed


  • Chalk


  • Chalk


  • Chalk


  • Chalk


  • MoistureMoist but well-drained

  • SoilSand, Clay, Chalk, Loam

  • pHAcid, Alkaline, Neutral


  • Ultimate height

    1.5-2.5 metres / 2.5-4 metres

  • Ultimate spread

    1.5-2.5 metres

  • Time to ultimate height

    5-10 years

How to grow

Cultivation Prefers well-drained gritty soil in full sun or part shade with shelter. Plant with the crown 5?8cm (2?3in) deep to encourage shoots to grow from below ground level. Can be grown in a container in a cold greenhouse or conservtory

Propagation Propagate by layering or semi-hardwood cuttings

Suggested planting locations and garden types Flower borders and beds City & Courtyard Gardens Cottage & Informal Garden Gravel Garden Patio & Container Plants Rock Garden

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