Pruning Mulberry
When and how — Morus nigra
Prune your mulberry in November and December — the optimal month is usually December.
The next pruning window is November.
When to prune?
The fruit mulberry is pruned in November and December.
Pruning fruit is about balancing growth and yield.
Fruit trees and bush fruits live in an eternal balance between leaf production (vigour) and fruit (yield). Prune too little and you get a dense plant with masses of small, disease-prone fruit. Prune too much and the plant reacts with watershoots and almost no fruit. The right line: once a year in winter dormancy (January–February) shape an open crown so light and air can reach every branch. With apple and pear, learn the difference between fruit spurs (short, 2–3-year-old wood — that's where the flowers come from) and wood buds (long whippy growth). Bush fruits need a different approach: redcurrant and gooseberry are pruned to an open goblet shape; blackcurrant needs renewal pruning where you remove one-third of the oldest stems at ground level each year.
How to prune mulberry
Black mulberry requires minimal pruning and resents heavy cutting, which can lead to dieback or excessive bleeding of sap. The best time to prune is in late autumn or early winter—November or December—when the tree is fully dormant and sap flow is at its lowest. Avoid pruning in late winter or spring, as mulberries bleed profusely from fresh cuts, weakening the tree and inviting disease. For the first few years, focus on establishing a balanced framework. Remove any crossing, rubbing, or inward-growing branches to create an open centre that allows light and air circulation. Cut back to a main branch or the trunk rather than leaving stubs. Use clean, sharp secateurs for stems up to 2 cm diameter and a pruning saw for anything thicker. Once mature, mulberries need very little intervention. Remove any dead, damaged, or diseased wood as you spot it, cutting back to healthy tissue. If branches become congested in the crown, thin out a few of the weakest or most awkwardly placed stems, but never remove more than a quarter of the canopy in one season. Mulberries fruit on short spurs on older wood, so avoid cutting back healthy fruiting branches. Old, neglected trees can be lightly renovated over two or three years, removing no more than one or two large limbs per winter. Always seal large cuts (over 5 cm diameter) with pruning paint to reduce moisture loss and infection risk. If the tree is growing well and fruiting reliably, the best approach is simply to leave it alone.
Common mistakes
✗ Finally pruning after five years of neglect
A drastic prune after years of nothing triggers an explosion of watershoots and almost no fruit the next year. Better to gradually restore over 2–3 years than do everything in one winter.
✗ Pruning blackcurrant the way you prune redcurrant
Blackcurrant fruits on one-year-old wood, redcurrant on short, multi-year spurs. Prune a blackcurrant for shape (like redcurrant) and you'll harvest nothing.
✗ Pruning during frost
Wounds don't heal in frost and the wood can split. Wait for a frost-free day, even in winter dormancy.
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).
