UK pruning guide · RHS timing
When to prune feather grass 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 feather grass
Shear the clump to 3–4 inches in late winter. Individually remove or shear off the long feathery seed heads once they start to look ragged, as these can self-seed freely.
Feather grass (Stipa barbata) is a cool-season grass valued for its silky, long-awned plumes in late spring and early summer. Remove spent flower stems after they turn straw-coloured. Cut the entire clump back to a few inches in late winter to clear dead foliage and encourage a fresh flush of growth.
More feather grass care for British gardens
Care at a glance
Pruning feather grass in the UK — FAQ
When should I prune feather grass in the UK?
Prune feather grass 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 feather grass in spring or summer in the UK?
There is no nesting-bird restriction that realistically applies to feather grass, 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 feather grass?
Shear the clump to 3–4 inches in late winter. Individually remove or shear off the long feathery seed heads once they start to look ragged, as these can self-seed freely.
How often does feather grass need pruning in a British garden?
Annually, with optional deadheading in summer. Feather grass (Stipa barbata) is a cool-season grass valued for its silky, long-awned plumes in late spring and early summer. Remove spent flower stems after they turn straw-coloured. Cut the entire clump back to a few inches in late winter to clear dead foliage and encourage a fresh flush of growth.
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.