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Pruning
When Is the Best Time to Prune Trees in the UK?
Every autumn, well-meaning gardeners across Hampshire cut back their plum and cherry trees. Some have been doing it for years without incident. And every spring, a proportion of those trees develop a distinctive silvery sheen on their foliage — the first visible sign of Chondrostereum purpureum, silver leaf disease, entering through pruning wounds made at exactly the wrong time of year. The pathogen is most active between September and May. Making cuts in October or November is, in effect, leaving the door open. By the time the silvery discolouration appears in the following summer, the fungus has already colonised the vascular tissue and the prognosis for the tree is poor. The Victoria plum cultivar is particularly susceptible. Silver leaf is one of the most preventable diseases in garden tree care — and one of the most commonly caused by a simple timing error.
The general rule — late winter, when trees are dormant — holds for most species, and it holds for good reasons: energy reserves are stored in the roots, branch structure is visible, wounds callus quickly once sap rises, and fungal spore activity is lower in cold, dry conditions. But the exceptions are numerous and consequential, and getting them wrong costs trees. This guide covers the most common garden species and gives you the specific windows that matter.
Species-by-Species Guide
| Species | Best time to prune | Why |
|---|---|---|
| Apple & Pear | November–February (dormant) | Avoids fireblight and maximises fruit production. See our fruit tree pruning page for detail. |
| Plum, Cherry, Damson | July–August (in leaf, dry weather) | Summer pruning avoids silver leaf disease (Chondrostereum purpureum), which infects through wounds in winter. Never prune stone fruit in autumn or winter. |
| Oak | December–February | Avoids oak processionary moth activity (spring/summer) and reduces risk of acute oak decline. Never prune in May when sap is actively rising. |
| Birch & Maple | July–August or December–January | Both bleed heavily when cut during sap rise (February–May). Mid-summer or mid-winter avoids this. |
| Beech & Hornbeam | November–February | Dormant season. Respond well to hard reduction if needed. |
| Ash | November–March | Dormant season. Note: many ash trees now require ash dieback assessment before pruning decisions are made. |
| Horse Chestnut | July–August or December–January | Susceptible to bleeding canker — avoid cutting when sap is moving. Summer or mid-winter preferable. |
| Willow & Poplar | November–February | Fast-growing; respond well to hard pollarding in winter. |
| Magnolia | June–August (immediately after flowering) | Avoids dieback from cold damage if pruned late in the year. Keep pruning minimal. |
| Evergreens (general) | April–May or August–September | Avoid hard frosts and avoid the hottest, driest summer weather. |
Nesting Bird Season
This is a legal constraint, not just a suggestion. Under the Wildlife and Countryside Act 1981, it is an offence to damage or destroy the nest of any wild bird that is in use or being built. Nesting season runs broadly from March to August, though some species nest earlier or later.
In practice, this means that pruning or felling work on hedges, dense shrubs and thick climbing vegetation should be avoided between March and August, or preceded by a nesting bird check. For standard tree pruning — where the crown is thinned but not destroyed — the risk is lower, but it’s worth a visual check before starting any work during this period.
We check for nesting activity at the start of every job during the nesting season.
Emergency and Safety Work
Deadwood removal, dangerous branch work and any tree surgery required for immediate safety reasons can be carried out at any time of year. The seasonal rules apply to planned maintenance pruning — if a branch is hanging over your roof after a storm, that takes priority over calendar considerations.
What About Conservation Areas and TPOs?
The optimal pruning season doesn’t change your planning obligations. If your tree is TPO-protected, you need written consent before any pruning — regardless of the time of year. If it’s in a conservation area, you need to give six weeks’ notice via a Section 211 notification. Factor this lead time into your planning if you want work done in a specific season.
See our pages on TPO applications and conservation area tree work for more detail.
Ready to Book Pruning Work?
We’ll advise on the right time for your specific trees and book the work into the appropriate season.