When is the Best Time to Prune Trees in Wiltshire?
One of the most common questions we are asked by homeowners across Wiltshire is when to prune their trees. It is a deceptively simple question with a more complex answer than most people expect - because the right time to prune depends largely on the species, the type of work required and the condition of the tree.
Get the timing right and pruning promotes healthy growth, good structure and a long lived tree. Get it wrong and you risk weakening the tree, spreading disease or losing that year's flowers or fruit. Here is our guide to the key pruning seasons and what they mean for the trees in your garden.
The General Rule - Dormant Season Pruning
For most broadleaved trees, the dormant season - broadly from late autumn through to early spring - is the safest and most practical time to carry out pruning work. During dormancy the tree is not actively growing, which means:
Pruning wounds callous over more quickly once growth resumes in spring
The risk of transmitting certain fungal diseases through fresh pruning cuts is reduced
With the leaves off the tree, the structure and any defects are clearly visible, making it easier to assess what work is needed
There is less disturbance to nesting birds and other wildlife
For most garden trees - oaks, ashes, limes, maples, birches and the like - late winter pruning between January and March is generally ideal. The tree is still dormant but spring is approaching, meaning the pruning wounds will begin to seal relatively quickly once growth starts.
Exceptions - Trees That Should Not Be Pruned in Winter
There are some important exceptions to the dormant season rule:
Stone fruit trees - plums, cherries, damsons and other Prunus species should never be pruned in winter. These species are highly susceptible to silver leaf disease, a serious fungal infection spread by spores that are most prevalent in the air during the winter months. Stone fruit should be pruned in late spring or summer when the tree is in active growth and able to seal wounds quickly.
Walnuts and birches - these species bleed sap heavily if pruned in late winter or early spring. Walnuts are best pruned in midsummer, birches in late autumn or early summer.
Evergreen trees and hedges - most evergreens are best pruned in late spring after the risk of hard frost has passed, or in late summer. Avoid pruning evergreens in autumn as the soft new growth produced will be vulnerable to frost damage.
Fruit Trees - A Seasonal Approach
Fruit trees have their own specific pruning calendar which is worth understanding in detail:
Apples and pears respond best to winter pruning between November and early March. Winter pruning encourages vigorous regrowth and is used to build and maintain the structure of the tree. Summer pruning of trained forms such as espaliers and cordons is also important for restricting growth and encouraging fruit bud development.
Plums, damsons and gages should be pruned in late spring or early summer - May to June is ideal. As with all stone fruit, winter pruning carries a significant risk of silver leaf infection and should be avoided.
Cherries are best pruned in late spring or early summer when in active growth. Both sweet and acid cherries are vulnerable to silver leaf and bacterial canker if pruned at the wrong time.
Figs require light pruning in late spring once the risk of frost has passed, removing dead or damaged wood and thinning congested growth.
Flowering Trees and Ornamentals
For flowering trees the key consideration is avoiding the removal of flower buds, which form at different times depending on the species:
Spring flowering trees such as magnolias, cherries grown for blossom and amelanchiers produce their flower buds on wood from the previous year. These should be pruned immediately after flowering in late spring to avoid removing next year's buds.
Summer flowering trees such as catalpa and some rowans produce their buds on new season's growth. These can be pruned in late winter without affecting flowering.
If you are unsure whether your ornamental tree will flower on old or new wood, the safest approach is to observe it through one full season before pruning, or ask us when we visit.
What About Nesting Birds?
This is an important consideration for all tree and hedge work in Wiltshire. Under the Wildlife and Countryside Act 1981 it is an offence to intentionally damage, destroy or take the nest of any wild bird while it is in use or being built. The main nesting season runs from 1st March to 31st August, though some species nest outside this period.
This does not mean that tree work cannot be carried out during the nesting season, but it does mean that trees and hedges should be carefully checked for active nests before any work begins. At Johnsons Arborist we always check for nesting activity before starting work and will advise if we identify any active nests that would prevent or delay the work.
A Quick Reference Guide
Here is a summary of the key pruning windows for common tree types:
Late winter (January - March)
Best for most broadleaved trees - oaks, limes, maples, hornbeams, rowans and the majority of ornamental garden trees. Also the main pruning season for apples and pears.
Late spring (April - June)
Best for stone fruit including plums, cherries, damsons and gages. Also suitable for spring flowering ornamentals immediately after flowering, and for most evergreens once the risk of frost has passed.
Summer (June - August)
Summer pruning of trained fruit tree forms. Also suitable for walnuts and some ornamentals. Avoid heavy pruning of most trees in midsummer heat.
Autumn (September - November)
Generally best avoided for most species as wounds heal slowly and the risk of fungal infection is higher. Birches can be pruned in late autumn.
When in Doubt, Ask a Professional
Every tree is different and the advice above is a general guide rather than a definitive set of rules. Factors including the age and condition of the tree, the extent of the proposed work and the specific variety can all influence the best timing. If you are unsure about the right time to prune your trees, we are always happy to advise.
Johnsons Arborist provides tree pruning and surgery services across Melksham, Chippenham, Devizes, Calne, Trowbridge, Bath and the wider Wiltshire area. Get in touch today for a free, no obligation visit and quote.