QuestionsHow to growTrees and ShrubsPruningOvergrown Griselinia Hedge 0 Vote Up Vote Down Mary O\’Leary asked 8 years ago My next door neighbour has a Griselinia hedge on both sides of her back garden. Both are at least 3 feet wide. If it’s cut back by half or even two thirds, will it sprout again, and if so when would be the best time to do it. 1 Answers 0 Vote Up Vote Down Gerry Daly Staff answered 6 years ago Griselinia can be cut back as much as you like in early April.