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If you are looking for advice on how and when to prune common lilac, and.

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.

Sep 27, The best time to prune a lilac tree is immediately after flowering. Perform a rejuvenation pruning on mature Japanese lilac trees every few years by cutting one-third of the large, old stems all the way back to the ground in late winter.

GO LIVE. 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 stumpcutter.buzzted Reading Time: 6 mins.

If you trim a lilac bush too late in the year, then you’ll cut off unwanted branches and next year’s blossoms. The ideal time to prune is just after the bush finishes blooming for the year.