Pruning Lilacs - Knowledgebase Question

Rye, CO
Avatar for Droch48
Question by Droch48
March 21, 1999
My Lilac bushes have become overgrown and are taller than I believe they should be. They are about 10ft tall. When is the best time of year to prune them back, and how far should they be pruned back? They still produce beautiful blooms but I would like to control them more and have them more tidy.

Answer from NGA
March 21, 1999
Depending upon species, your lilacs may already have reached their mature height. But, it's easy to reduce the size of lilacs and to make them neat in appearance. Wait until they finish blooming and cut the branches back by about one third. Expect one or two new shoots to develop wherever you make a pruning cut. Lilac's bloom on the ends of branches, and need a year to develop the flowering buds, so prune right after flowering to give your shrubs a chance to produce new wood and buds for flowering next spring.

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