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Jul 08, The time to prune mature lilac plants is just after the flowers have faded in the spring. Lilacs set next season's flower buds almost immediately, so late pruning will mean sacrificing the next year's flowers.   Pruning early also gives new shoots more time and energy to develop, ensuring plenty of blooms for the following spring.

Knowing when to trim lilac bushes is important. Most lilacs don’t require pruning until they reach about 6 to 8 feet (m.) tall. The best time for pruning Estimated Reading Time: 2 mins. Jul 08, Although you'll be losing some flowers for the current year, pruning overgrown lilacs is easiest early in the spring before the branches leaf out.

However, if left to grow and spread on their own, common lilacs will eventually only flower on the tops of the uppermost branches.

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