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New stems often bloom very well.

No, like flowering bulbs, cutting the flowers makes for better flowers next year, because you prevent plant energy spent on growing seeds. I cut off all the flower clusters when they fade on my very young bushes, so they use energy on growing, not seeds.

Apr 06, The best time to prune a lilac bush is right after the plant is done blooming for the year. If you wait too long after they bloom, new buds will blossom. You don’t want to cut off the new buds when you’re cutting off unwanted branches as you won’t have any flowers Estimated Reading Time: 3 mins. Apr 02, 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 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, 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.

Thus, you should be pruning lilacs annually to maintain their form and create a balance of new flowering shoots and older stems. .