Mountain clematis and Trumpet vine are often considered for the same spot in the garden (flowers, screening, pollinator friendly). The data below shows where they differ: size, hardiness, care, toxicity and price.
Clematis montana 8 m × 4 m after 10 years
One of the most vigorous clematis: it climbs by twisting leaf stalks, so it needs wires, a trellis, a fence or an old tree, and will not go up a…
Campsis radicans 7 m × 3 m after 10 years
A very vigorous deciduous climber that clings to walls, fences and tree trunks with aerial roots and carries clusters of orange-red trumpet flowers…
Trumpet vine is hardier: down to -29 °C, against -18 °C for Mountain clematis.
Trumpet vine tolerates drought better than Mountain clematis.
Mountain clematis needs less care than Trumpet vine.
|
Feature
|
Mountain clematis
|
Trumpet vine
|
|---|---|---|
| Group | Climber | Climber |
| Size after 10 years | 8 m × 4 m | 7 m × 3 m |
| Ultimate size | 5–12 m × 2.4–4.5 m | 7.6–12 m × 1.5–4 m |
| Growth rate | Fast | Fast |
| Light | Full sun, Part shade | Full sun, Part shade |
| Soil | Average garden soil, Clay, Sandy, Calcareous | Average garden soil, Clay, Sandy, Calcareous, Acidic |
| Hardiness | down to -18 °C (USDA 6, RHS H6) | down to -29 °C (USDA 4, RHS H7) |
| Foliage | Deciduous | Deciduous |
| Flowering | May–June, white, pink | June–September, orange, red |
| Water need | Medium | Medium |
| Drought tolerance | Low | High |
| Maintenance | Low | High |
| Planting distance | 200 cm | 250 cm |
| For dogs | Toxic | no data |
| For cats | Toxic | no data |
| For children | Toxic | Mildly toxic |
| Typical price | approx. €23 | approx. €27 |
Prices are rounded, indicative values. Toxicity data is for information only. If your pet or child has eaten a plant, contact a vet or a doctor. Data updated: October 13, 2026
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