QuestionsHow to growTrees and ShrubsPruningovergrown olearia 0 Vote Up Vote Down Angela Shorten asked 15 years ago Planted some olearia a few years ago, now very overgrown and ‘leggy’. Could I cut these back hard to encourage growth at the base ? 1 Answers 0 Vote Up Vote Down Gerry Daly Staff answered 7 years ago You can olearia back as hard as you like and it will sprout again. Early April is a good time.