‘Very light pruning (two or three small branches) is permissible in summer, but do not prune birch trees in late summer or fall.’ Also do not prune in spring, as it will actively harm birch trees.

birch, walnut and cherry trees which all bleed extensively, even towards the end of their dormant season, so prune these in mid-summer after new growth has matured. Conifers require little or no ...