We have an 8 - 10 ft Lilac bush that we need to trim back - a LOT. When is the best time to do this? I know after the flowers are spent, but is the end of June too late? And how severely can we cut it back? We do want to keep the bush, but it really has gotten to be too large. We live in Calgary, AB, Cananda - so are summers and fall can sometimes be short... in case this affects when we should prune. Any advice would be greatly appreciated. Cheers Rona Smith
This article will help you with pruning.