The time to prune mature lilac plants is just after the flowers have faded. They set the next season's flower buds almost immediately, so late pruning will mean sacrificing next year's flowers. Pruning early also gives the new shoots more energy to develop.
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https://www.thespruce.com/pruning-lilacs-how-and-when-to-prune-lilacs-1403004
The time to prune mature lilac plants is just after the flowers have faded. They set the next season's flower buds almost immediately, so late pruning will mean sacrificing next year's flowers. Pruning early also gives the new shoots more energy to develop.
The best time to prune lilacs if right after they are finished blooming. You get to enjoy the blooms and then prepare the bush for next year's blooms.
After they are done blooming it can be done, or wait until they are in the dormant season.