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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, 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. Lilac bushes bloom only once each year, in spring, but they make new buds after they bloom. The buds become the next year’s flowers.

If you trim a lilac bush too late in the year, then you’ll cut. Mary: Your lilac-loping tale of woe illustrates the serious negative long-term effects Fall pruning can have on the health of plants. The best thing you can do for those lilacs right now is to shovel an inch of compost around their base, apologize for that assault last Fall and explain that you will now only prune them after they finish blooming in the bushhaul.barted Reading Time: 6 mins.