I have heard conflicting views on when to prune a PlumTree. I have an established tree and I need to cut of a bough that has grown over to my neighbour's garden. Some say I should leave it until mid-summer (July) so that it can heal over the summer and avoid getting silver leaf. Other's views are that I should do it now - October. The tree has suffered with the dry weather and has shed most its leaves. This is a good tree and I do not want to loose it - I would appreciate your views.