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Pruning guide · Climber
American wisteria: when and how to prune
Wisteria frutescens
American wisteria is best pruned in February and August.
| Pruning months | February and August |
|---|---|
| Nesting season (15 March–15 August) | Take care in August |
| Flowering | June–July |
| Good for bees, butterflies and birds | Yes, for bees |
| Native to Belgium | No, planted |
| Poisonous to people and pets | Yes, take care with children and pets |
American wisteria: when to prune it?
Twice a year: in August and in February.
American wisteria: how to prune it?
- August: shorten this year’s long, thin side shoots to 5–6 leaves (about 20–30 cm).
- February: shorten those same side shoots again to 2–3 buds. This is where the flower clusters form.
- Tie the main shoots to the support and shorten the tips if it gets too long.
- Remove shoots below the graft and suckers from the roots.
How much to cut, and how often?
- There are 2 pruning periods a year: February and August. You don’t have to prune in every one.
What does it mean for wildlife?
- Pruning in August can fall in the nesting season (15 March–15 August). Check carefully for nesting birds first: disturbing an active nest is against the law.
- American wisteria flowers in June–July, when it attracts bees.
- Prunings can go on a dead hedge or brash pile in a corner of the garden: shelter for hedgehogs, wrens and insects.
Common mistakes
- Clipping without first checking for nesting birds.
Caution: Wear gloves and keep clippings out of reach of children and animals: all parts are poisonous.
Nearby: related pruning guides
Plant profile: American wisteria · Pruning calendar and basic rules
This guide is compiled from the Bladwijzer plant profile and pruning calendar.