UK pruning guide · RHS timing
When to prune lavender in the UK
Why the timing differs here
RHS guidance puts evergreen pruning in mid to late spring, once the risk of a hard frost has passed. Cutting evergreens in a British winter exposes soft new growth to frost damage, which is why the timing sits later here than in milder climates.
How to prune lavender
After flowering, cut back stems to about 2.5 cm (1 in) above the lowest green leaves, shaping the plant into a neat dome. In spring, remove only frost-damaged tips, not hard old wood.
Lavender must be pruned annually or it becomes an open, woody, short-lived plant. Cut back into the green growth after flowering each year to maintain a tight mound. A light trim in early spring removes any winter-damaged tips. Never cut into old grey-brown wood — it will not regenerate. Correct pruning annually can double the plant's productive lifespan.
More lavender care for British gardens
Care at a glance
Pruning lavender in the UK — FAQ
When should I prune lavender in the UK?
Prune lavender in mid to late spring. RHS guidance puts evergreen pruning in mid to late spring, once the risk of a hard frost has passed. Cutting evergreens in a British winter exposes soft new growth to frost damage, which is why the timing sits later here than in milder climates.
Is it illegal to prune lavender in spring or summer in the UK?
Pruning itself is not illegal, but destroying an active nest is. Under the Wildlife and Countryside Act 1981 it is a criminal offence to damage or destroy the nest of any wild bird while it is being built or in use, and the RHS treats the nesting season as March to August, sometimes longer. Check lavender for nests before cutting, and if you find an active one, leave that part of the plant until the birds have fledged.
How do you prune lavender?
After flowering, cut back stems to about 2.5 cm (1 in) above the lowest green leaves, shaping the plant into a neat dome. In spring, remove only frost-damaged tips, not hard old wood.
How often does lavender need pruning in a British garden?
Annually (twice: post-flower + spring tidy). Lavender must be pruned annually or it becomes an open, woody, short-lived plant. Cut back into the green growth after flowering each year to maintain a tight mound. A light trim in early spring removes any winter-damaged tips. Never cut into old grey-brown wood — it will not regenerate. Correct pruning annually can double the plant's productive lifespan.
Why is UK pruning timing different from American advice?
Most pruning guides online are written for US conditions and anchored to USDA zones. Britain's maritime climate gives milder winters but later, less predictable last frosts — from March in the south-west to mid-May in the north — so the RHS advises against winter pruning for most plants: it pushes out soft growth that a late frost then kills. Britain also has the nesting-bird law, which has no US equivalent.