The short answer
For most garden hedges, the main cut is best done in late summer, from around August to early September, once the nesting season is over. Fast growers such as privet and leylandii often need a second light trim in late spring or early summer to stay sharp.
Timing by hedge type
Privet and laurel can be cut two or three times a year. Leylandii and other conifers are best cut little and often, because they will not regrow from bare wood. Beech and hornbeam keep their brown leaves in winter and are usually cut once in late summer. Yew and box suit a main cut in late summer, with a tidy-up if needed.
Bird nesting season
Wild birds are protected while nesting. The main nesting period runs from roughly March to August, and it is an offence to intentionally damage an active nest. Check carefully before cutting. If there is an active nest, leave that section alone until the chicks have fledged.
Can I cut a hedge in winter?
Yes, for formal reduction of deciduous hedges, winter is a good time because the plant is dormant and there are no nests. Avoid hard cutting in frost. Evergreen hedges are better left until spring or late summer.
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Frequently asked questions
Is it illegal to cut a hedge in nesting season?
It is not illegal to cut a hedge between March and August, but it is an offence to intentionally damage or destroy an active nest. If birds are nesting, wait until they have left.
How often should a hedge be cut?
Most hedges need one to two cuts a year. Fast growers such as privet and leylandii may need a third light trim.