When, if any, is the best time to prune my Prunus Subhirtella Autumnalis?
The best time to prune any member of the plum and cherry family is in late May or early June, when they are in full growth.This is a bit different to most other plants which are usually pruned when they are dormant in the autumn and winter. The reason for this difference is that the main diseases of plums and cherries which are bacterial canker and silver leaf infect the tree through wounds like pruning cuts. So if these are made while the tree is growing strongly it will soon heal itself before infection takes place. If your tree is behaving itself there is no need for any pruning to be done at all.
