QuestionsHow to growTrees and ShrubsPruningPruning rhododendron 0 Vote Up Vote Down mike foley asked 15 years ago I have a rhododendron and i dont know whether to prune it or not. 1 Answers 0 Vote Up Vote Down Gerry Daly Staff answered 7 years ago Rhododendron is generally not pruned unless it get too big and it can be cut back hard in early spring and will sprout again, even from very old wood.