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Growing Lilacs 3 Pruning is unnecessary for the first 3 or 4 years.
Thereafter, limit pruning to the removal of weaker wood from the center of the bush. This prevents a thicket from developing. You should do this soon after flowers have fallen. Do not prune in late summer, fall, or winter; late pruning often results in removal of flower buds.
Pruning shears or loppers will generally handle these stems.
Jun 02, The best time of year to prune lilac bushes is in the spring just after the blooms fade. Lilac bushes produce flower buds for the next season shortly after they’re done with the current year’s blooms. So don’t wait too long or you’ll be cutting off next year’s flowers! If your lilac plant is young, you may not need to prune at treeleaning.clubs: 2.