24/11/2015 Last Modified: 04/02/2016
If works are undertaken in the spring then the tree may become more vulnerable to pest and disease attack. If works are carried out in the autumn then the tree will not be able to get all the nutrients that it needs for the next spring and the tree may be put under unnecessary stress, increasing the likelihood of disease.
Outside these periods most trees can be pruned at any time of the year, with a few exceptions:
Maple, Birch, Beech and Walnut should be pruned in leaf or just after leaf fall and Magnolia in high summer to avoid ‘bleeding’ (exuding sap), which, although not considered damaging, can be unsightly.
If possible, pruning should be avoided when recovery may be impaired, for example during a period of physiological stress following previous tree work or construction-related damage or during seasonal weather extremes such as drought or extended heavy frost.