We do notice at Tarzan Tree surgery that a lot of people have questions about the timing of tree work. We mostly like to say: "The methode of pruning is so much more important than the time of year".
The main thing for us is to keep in mind:
Nov. - Feb. A tree is totally asleep its energy is stored in stem and roots. The tree can not respond to human actions.
March - May. The most bussy time a year for a tree with the energy stored they grow nem branches and leaves. Severe response to human actions
June - Aug. The tree is awake but steady. Steady reacting on human actions.
Sept. - Okt. The Tree is taking his energy from its leaves and stores it in her stem and roots. Hardly responds to human actions.
For every tree the way of pruning has to suit the situation and the tree itself for some situations pruning is better in summer, in some in winter. Over all mostly summer and autumn are the best periods, Winter is also possible (especially for pollarding) and spring is often not good (exceptions are there). Please just ask us any time.