How do you prune a lilac that has grown out of control?

Question: I’m looking for help on how to best prune a lilac tree/bush that has grown out of control.  Answer: Liz Stanley,  Horticulture Community Education Assistant For older common lilac stands (Syringa vulgaris) that need renovation, early spring is an excellent time of year to prune. Pruning when they’re still dormant means that you can read more How do you prune a lilac that has grown out of control?