QuestionsHow to growTrees and ShrubsPruningpruning 0 Vote Up Vote Down Rose Ward asked 16 years ago I want to prune my rhoderdendrum, but dont know how, i dont want to ruin it , so how do i prune it, what branches do i prune etc, 1 Answers 0 Vote Up Vote Down Gerry Daly Staff answered 7 years ago Rhododendron can be pruned as hard as you like and this is normally done just after flowering.