UK pruning guide · RHS timing
When to prune lemongrass in the UK
Why the timing differs here
British pruning timing is set by the last frost rather than the calendar. The RHS advises against winter pruning for most plants because it pushes out soft growth that a late frost then kills — and UK last frosts run from March in the south-west to mid-May in the north.
How to prune lemongrass
Pull or cut away dead and yellowed outer leaves at the base. To rejuvenate a large clump, cut all stalks to 15–20 cm above soil with loppers or a sharp knife. Wear gloves — leaf edges are sharp.
Lemongrass requires minimal pruning. Remove dead, brown outer leaves at the base as needed throughout the year. If the clump becomes very large and untidy, cut all stalks back to about 15–20 cm above soil level in late winter or early spring before new growth begins. Harvest individual stalks from the outside of the clump as needed.
More lemongrass care for British gardens
Care at a glance
Pruning lemongrass in the UK — FAQ
When should I prune lemongrass in the UK?
Prune lemongrass in spring, once growth resumes. British pruning timing is set by the last frost rather than the calendar. The RHS advises against winter pruning for most plants because it pushes out soft growth that a late frost then kills — and UK last frosts run from March in the south-west to mid-May in the north.
Is it illegal to prune lemongrass in spring or summer in the UK?
There is no nesting-bird restriction that realistically applies to lemongrass, 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 lemongrass?
Pull or cut away dead and yellowed outer leaves at the base. To rejuvenate a large clump, cut all stalks to 15–20 cm above soil with loppers or a sharp knife. Wear gloves — leaf edges are sharp.
How often does lemongrass need pruning in a British garden?
Dead-leaf removal as needed; rejuvenation cut every 1–2 years. Lemongrass requires minimal pruning. Remove dead, brown outer leaves at the base as needed throughout the year. If the clump becomes very large and untidy, cut all stalks back to about 15–20 cm above soil level in late winter or early spring before new growth begins. Harvest individual stalks from the outside of the clump as needed.
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.