Pruning Cranesbill
When and how — Geranium 'Rozanne'
Prune your cranesbill in March and November — the optimal month is usually November.
The next pruning window is November.
When to prune?
The perennial cranesbill is pruned in March and November.
With perennials, pruning is really seasonal management.
You don't prune perennials the way you prune shrubs. The work happens at three moments: (1) deadheading spent flower stems during the season to encourage repeat bloom, (2) optionally cutting back to about 10–15 cm above ground in late autumn, and (3) clearing all the old foliage in March before the new shoots emerge. Many gardeners now deliberately leave the old growth standing through winter — it protects the crown and shelters overwintering insects. Which approach to choose depends on taste and species: evergreen perennials (hellebore, bergenia) look better left alone, while wet-rotting species (hosta) need to come down after the first frost.
How to prune cranesbill
Geranium 'Rozanne' is exceptionally low-maintenance and doesn't require traditional pruning in the way shrubs do, but a couple of seasonal tidy-ups will keep it flowering prolifically and looking tidy. The main pruning window is in March or November, depending on your preference and local conditions. In November, once flowering has finished and the foliage begins to look tatty after the first frosts, you can cut the whole plant back to ground level using secateurs or garden shears. This autumn cut-back tidies the border for winter and removes old, frost-damaged leaves that can harbour slugs and diseases. Alternatively, if you prefer to leave some winter structure or live in a milder area, delay this job until early March. Cutting back in early spring, just as new growth begins to emerge at the base, works equally well and provides a bit of winter interest. Throughout the long flowering season—from early summer right through to autumn—deadheading is not strictly necessary. 'Rozanne' is sterile and sets no seed, so it continues producing flowers without the need to remove spent blooms. However, if the plant starts to look straggly or tired by midsummer, you can give it a light trim, cutting back flowered stems by about a third. This encourages a fresh flush of foliage and flowers. Use clean, sharp secateurs for any cutting to avoid damaging the crown. There's no complicated technique: simply shear the plant back evenly, and it will regrow vigorously from the base.
Common mistakes
✗ Cutting back too early in spring
Late frost can still strike and the old foliage protects the crown. Wait until the first new shoots are visible (usually mid-March) — then you know the season has actually started.
✗ Skipping deadheading
Hardy geranium, salvia, lupin and delphinium will give a second flush if you cut spent stems back to just above a pair of healthy leaves as soon as the first flowers fade.
✗ Cutting ornamental grasses down in autumn
The dry stems are the whole point of winter interest, AND they protect the crown from frost and waterlogging. Cut down to a fist's height only in late February.
Combine with feeding
In March you can combine pruning with feeding — efficient, and you only disturb the plant once. Read the full care guide for cranesbill →
Hold off on pruning
Better to wait than prune at the wrong moment. The next optimal window is November. Until then: leave the plant alone — only remove dead or diseased wood (which you can do year-round).
