QuestionsHow to growTrees and ShrubsPruningPhotinia Red Robin 0 Vote Up Vote Down joan connolly asked 12 years ago I have a photinia Red Robin hedge since august 2010. I havnt prunned it yet cos its thriving,new growth past two weeks. when should i cut it back? 1 Answers 0 Vote Up Vote Down Gerry Daly Staff answered 5 years ago You can clip it next April and / or August.