Since lilac wood needs to be 3 or more years.

Apr 02, The best time for pruning lilac bushes is right after their flowering has ceased. This allows new shoots plenty of time to develop the next season of blooms. Pruning lilacs too late can kill young developing buds. Jul 08, Most flowering shrubs need regular pruning to keep them vibrant, and the common lilac (Syringa vulgaris) is no exception.

In late winter of the following year, select and retain several strong, healthy shoots to form the shrub framework and remove all the others at ground level.

Lilac bushes will typically flower without any effort from you. However, if left to grow and spread on their own, common lilacs will eventually only flower on the tops of the uppermost branches. One possibility- lilacs flower on the growth that occurs after the last flowering- so if you prune in the fall, you’ll be pruning off the branches that would otherwise flower the next spring.

Jun 19, Many lilacs can grow thirty feet tall without regular pruning. Pruning lilac bushes on a regular basis keeps them from becoming too tall and unmanageable. My lilac tree and I say tree and not a bush because it is way over 10 feet tall, probably closer to 15 feet. It is over years old and has not been pruned in about 20 shrubdrop.buzzted Reading Time: 3 mins.