QuestionsHow to growTrees and ShrubsPruningPyracanthus 0 Vote Up Vote Down Sue Cullen asked 8 years ago We planted pyracantha as a hedge 18 months ago and it’s doing well. When and how would be best to cut it back as it’s growing too tall next to our neighbour’s wall? 1 Answers 0 Vote Up Vote Down Gerry Daly Staff answered 6 years ago  Cut new growth back in July, old growth in late winter. If it is too big after 18 months, how will it be after 18 years?Â