UK pruning guide · RHS timing
When to prune raceme catmint in the UK
Why the timing differs here
For shrubs that flower on the current season's growth, the RHS times pruning to early or mid spring — after severe weather has passed and once the growth buds begin to swell. In Britain that is usually March into April rather than the February common in warmer regions; prune too early and the new shoots meet a late frost.
How to prune raceme catmint
Using shears or secateurs, cut the whole mound back by two-thirds to just above basal growth immediately after the first flush fades. Water in after cutting. In late autumn or early spring, cut remaining stems to ground level.
Raceme catmint (Nepeta racemosa) is one of the most rewarding plants to prune: cut it back hard by two-thirds immediately after the first flowering flush and it will reliably produce a strong second flush in late summer. Without cutting back it becomes lax and woody. Tidy to ground level in late autumn.
More raceme catmint care for British gardens
Care at a glance
Pruning raceme catmint in the UK — FAQ
When should I prune raceme catmint in the UK?
Prune raceme catmint in early to mid spring. For shrubs that flower on the current season's growth, the RHS times pruning to early or mid spring — after severe weather has passed and once the growth buds begin to swell. In Britain that is usually March into April rather than the February common in warmer regions; prune too early and the new shoots meet a late frost.
Is it illegal to prune raceme catmint in spring or summer in the UK?
There is no nesting-bird restriction that realistically applies to raceme catmint, since birds do not nest in it. The Wildlife and Countryside Act 1981 still protects any active nest you do find anywhere in the garden — the rule is about the nest, not the plant.
How do you prune raceme catmint?
Using shears or secateurs, cut the whole mound back by two-thirds to just above basal growth immediately after the first flush fades. Water in after cutting. In late autumn or early spring, cut remaining stems to ground level.
How often does raceme catmint need pruning in a British garden?
Cut back hard once mid-season; annual ground-level tidy in autumn. Raceme catmint (Nepeta racemosa) is one of the most rewarding plants to prune: cut it back hard by two-thirds immediately after the first flowering flush and it will reliably produce a strong second flush in late summer. Without cutting back it becomes lax and woody. Tidy to ground level in late autumn.
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.