• 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 montana var. wilsonii

© RHS

  • Synonyms Clematis montana 'Wilsonii Sprague'
    Clematis repens Veitch

  • Family Ranunculaceae

  • 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 seedheads in autumn

  • Details C. montana var. wilsonii is a deciduous climber up to 9 metres high with green leaves and starry flowers that appear later than other varieties of this species. The flowers are white with greeny-cream stamens and have a scent reminiscent of chocolate

  • Plant range China

Characteristics

  • Foliage Deciduous

  • Habit Climbing

  • 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)

    H5

Colour

Sunlight

  • Partial Shade

  • Full Sun

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

  • Exposure Sheltered or Exposed

Soil

  • Loam

    Loam

  • Chalk

    Chalk

  • Clay

    Clay

  • Sand

    Sand

  • MoistureMoist but well-drained

  • SoilLoam, Chalk, Clay, Sand

  • pHAlkaline, Neutral

Size

  • Ultimate height 8-12 metres

  • Ultimate spread 1.5-2.5 metres

  • Time to ultimate height 2-5 years

How to grow

Cultivation Plant in a moisture-retentive, well-drained soil; it grows best in sun or partial shade, but avoid frost pockets because frost can kill flower buds; keep the base of the plant and the roots cool and shaded by other plants or a layer of pebbles or flat stones at the baseSee clematis cultivation for more advice

Propagation Propagate by double leaf-bud semi-ripe cuttings taken from spring to late summer, or by layering from late winter to spring

Suggested planting locations and garden types Wall-side Borders Cottage & Informal Garden

How to care

Pruning Clematis pruning: group one

Pests May be affected by pests such as aphids and capsid bug; flowers may be damaged by earwigs; young shoots are vulnerable to slugs and snails

Diseases May be affected by clematis wilt and powdery mildews; pruned stems may be affected by clematis slime flux

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