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Apr 02, 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. 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, If you can't stand the look of your old lilac or you just want a quicker approach, you can take the drastic measure of cutting back the entire plant to about 6 to 8 inches above the ground in the early spring. Apr 28, To prune your lilacs, start deadheading in early-to-late spring by cutting the flowers at their base just after they’ve reached their peak.

You should also cut any flowers that are already dying so they don’t sap energy that could be used for new growth%(4). Timing.

Tips and Warnings.

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.

Jun 19, Knowing when to trim older lilac bushes is important. Most lilacs don’t require pruning until they reach about 6 to 8 feet tall. The best time for pruning older lilac bushes is right after their flowering has ceased.

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This allows new shoots time to develop the next season of blooms. Pruning too late can kill young developing buds.