Photo: Jean-Pol GRANDMONT, CC BY 3.0 · source
Pruning guide · Broadleaf tree
False acacia: when and how to prune
Robinia pseudoacacia
False acacia is best pruned in June–August.
| Pruning months | June–August |
|---|---|
| Nesting season (15 March–15 August) | Take care in June–August |
| Flowering | June |
| Good for bees, butterflies and birds | Yes, for bees |
| Native to Belgium | No, naturalised |
| Poisonous to people and pets | Yes, take care with children and pets |
False acacia: when to prune it?
Dead, diseased and broken branches can be removed at any time of year. Preferably prune in summer.
False acacia: how to prune it?
- Prune as little as possible: hard pruning or felling triggers masses of root suckers.
- The wood is brittle: remove dead and split branches in good time and check old trees for cracks.
- If you want to get rid of a false acacia, don’t simply fell it, but let it die off first by ring-barking it (see Problems).
How much to cut, and how often?
- One pruning period a year: June–August.
What does it mean for wildlife?
- Spreads in the wild at the expense of native species. Better removed than pruned, and never dump the prunings in the countryside.
- Pruning in June–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.
- False acacia flowers in June, when it attracts bees.
- If pruning falls during flowering, wait until it is over or leave part of the plant to flower, so bees and butterflies still benefit.
- 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: the twigs have sharp spines, and bark and leaves are poisonous. Don’t leave prunings where horses or livestock can reach them.
Nearby: related pruning guides
Similar to: Difference from golden rain tree · Difference from Japanese pagoda tree · Difference from honey locust
Plant profile: False acacia · Pruning calendar and basic rules
This guide is compiled from the Bladwijzer plant profile and pruning calendar.