QuestionsHow to growTrees and ShrubsHedges and Shelter beltsLaurel Hedge 0 Vote Up Vote Down Declan Mahon asked 14 years ago Would it be too late in late Sept. to trim a laurel hedge? 1 Answers 0 Vote Up Vote Down Gerry Daly Staff answered 7 years ago September is fine, early September is better because it gives the plants a bit of time to adapt. But there is no great risk involved.