Photo: Jerzy Opioła, CC BY-SA 4.0 · source
Pruning guide · Shrub
Swiss willow (Salix helvetica): when and how to prune
Salix helvetica
Swiss willow (Salix helvetica) is best pruned in May.
| Pruning months | May |
|---|---|
| Nesting season (15 March–15 August) | Take care in May |
| Flowering | April–May |
| Good for bees, butterflies and birds | Yes, for bees |
| Native to Belgium | No, planted |
Swiss willow (Salix helvetica): when to prune it?
Straight after flowering, in May. Otherwise it hardly needs pruning.
What else to prune in those months? May
Swiss willow (Salix helvetica): how to prune it?
- Cut long, stray or dead twigs back to a side shoot or bud.
- Keep it compact by shortening the branches by a third after flowering.
- Remove dead wood completely.
- Do not prune in winter: you would cut off next spring’s catkins.
How much to cut, and how often?
- One pruning period a year: May.
- Prune in moderation: never remove more than about a third of the shrub at once.
What does it mean for wildlife?
- Pruning in May can fall in the nesting season (15 March–15 August). Check carefully for nesting birds first: disturbing an active nest is against the law.
- Swiss willow (Salix helvetica) flowers in April–May, 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.
- Leaving a stub or sawing flush with the trunk: cut just outside the branch collar.
Caution: Do not cut into old, bare wood: it regrows poorly from there. Stick to young, leafy branches.
Nearby: related pruning guides
Plant profile: Swiss willow (Salix helvetica) · Pruning calendar and basic rules
This guide is compiled from the Bladwijzer plant profile and pruning calendar.