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Cut the lilac flowers off the plant in early morning or late evening.

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.

Beside this, is it OK to trim bushes in the fall? Do not prune by cutting those stems to the outside of the shape of the shrub. Apr 02, 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. If you are pruning lilac trees or shrubs entirely to within inches of the ground, it is best to do so in early spring.

Jul 08, Most flowering shrubs need regular pruning to keep them vibrant, and the common lilac (Syringa vulgaris) is no exception. Lilac bushes will typically flower without any effort from you.

Check the plant for disease and pests.

However, if left to grow and spread on their own, common lilacs will eventually only flower on the tops of the uppermost branches. Nov 17, Others, such as lilacs, bloom only on old wood from the previous season. Thus, if you prune at any time other than immediately after flowering, you will cut off next year's blooms. For lilacs, the recommended method is generally to remove one third of the old wood each year immediately after flowering and shape the shrub over a number of seasons.

Of course, you can prune in the fall Estimated Reading Time: 2 mins.