QuestionsHow to growTrees and ShrubsHedges and Shelter beltsHolly tree pruning 0 Vote Up Vote Down Conor Clinch asked 17 years ago Hi Gerry, I have a couple of holly trees approx 2m high – they have never been pruned but I would like to restrict their height and train them into a ‘hedge’ shape. Should I just lop the top third off? When should I do it – Spring? Thanks , Conor 1 Answers 0 Vote Up Vote Down Gerry Daly Staff answered 7 years ago Holly tolerates any kind of cutting back or pruning, so feel free and do so from April onwards.