Vigorous Himalayan deciduous clematis with masses of small white or pink four-petalled flowers smothering the plant in late spring. The earliest and most reliably free-flowering of the large clematis species.
Hardiness ratings
| System | Rating | Temperature range | How to read it |
|---|---|---|---|
| USDA hardiness zone | Zone 6–9 | −23.3 °C to −1.1 °C | Plant tolerates down to this zone |
| RHS hardiness rating | H5 | −15 °C to −10 °C | Plant needs at least this level of cold tolerance |
| Canadian plant hardiness zone | Zone 6–8 | −18 °C to −1 °C | Plant tolerates down to this zone |
| Australian (ANBG) zone | Zone 2–6 | −10 °C to 15 °C | Plant tolerates down to this zone |
Growing notes
- Plant against a large wall, tree, or pergola — vigorous, capable of covering 6 m × 6 m within a few years
- Flowers May — among the earliest reliably mass-flowering climbers, a key spring seasonal marker
- Cultivar ‘Rubens’ (pink) and ‘Grandiflora’ (large white) are the standard garden forms
- Pruning Group 1 — flowers on previous year’s wood, prune lightly only after flowering
Pet caution: Mountain clematis is listed as potentially harmful to cats and/or dogs. Keep pets from grazing on it, and contact a vet if you suspect your animal has eaten some.
Categories
Related plants
Cross-check Mountain clematis against your zones