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Apr 02, When to Trim Lilac Bushes. 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. May 20, New lilac bushes don't require maintenance pruning until they are about 6 - 8' tall. 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. Jun 19, Most lilacs don’t require pruning until they reach about 6 to 8 feet tall.

But trimming all your new stems will result in the plant failing to bloom in the future.

The best time for pruning older lilac bushes is right after their flowering has ceased. This allows new shoots time to develop the next season of blooms. Pruning too late can kill young developing bushremover.barted Reading Time: 3 mins. Jul 08, The time to prune mature lilac plants is just after the flowers have faded in the spring.

If a bloom fades earlier in the season than the flowers on other branches, cut the spent bloom before the others.

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. Lilac trees that are over three years old can safely have these removed as close to the ground as possible. Do this from mid-June onwards. For new lilac trees in their first year, remove all the forming flower buds before they start to bloom.

This is usually around the first week of May. 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 for the next season.