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AGM plants have been through a rigorous trial and assessment programme. They are:
This plant will provide nectar and pollen for bees and the many other types of pollinating insects.
It is included in an evolving list of plants carefully researched and chosen by RHS experts. Divided into 3 groups these lists, linked below, are maintained by a team of RHS staff and are reviewed annually.
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Other common names mountain clematis Himalayan clematis
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 is a vigorous deciduous species, reaching 7-12m if left unchecked. Plants are smothered in small, single, white flowers in late spring; leaves often have a bronze or purple hue when they first emerge before turning green
Plant range Him., China, Tibet
Foliage Deciduous
Habit Climbing
Hardiness
All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees C) are shown in brackets
H5
Full Sun
Partial Shade
Aspect North-facing or West-facing or East-facing or South-facing
Exposure Exposed or Sheltered
Chalk
Clay
Loam
Sand
MoistureMoist but well-drained
SoilChalk, Clay, Loam, Sand
pHAlkaline, Neutral
Ultimate height 8-12 metres
Ultimate spread 2.5-4 metres
Time to ultimate height 5-10 years
Cultivation Plant in a moisture-retentive, well-drained soil, with the roots and base of the plant kept cool and shaded by other plants or a layer of pebbles at the base. Plant with the crown 5-8cm deep to encourage shoots to grow from below ground level. Good for scrambling up trees in a naturalistic setting. See clematis cultivation
Propagation Propagate by layering or semi-hardwood cuttings
Suggested planting locations and garden types Wall-side Borders Cottage & Informal Garden
Pruning Flowers on previous season's growth. Pruning (clematis) group 1
Pests Young shoots may be troubled by aphids
Diseases May suffer from powdery mildews, clematis slime flux or clematis wilt
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