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Labels: gardening and plants.

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.

You may see a sticky substance known as honeydew left behind on the leaves which leads to the growth of sooty, black moulds.

Pruning lilacs too late can kill young developing buds. 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 bushclear.buzzted Reading Time: 6 mins. Jun 03, Pruning lilacs is best done within a few weeks after the blooms fade.

Trim them with bypass pruning shears, cutting blooms off just above the place the stem forks beneath the bloom. Old growth should also be cut back every few years to help keep the bush productive. Remove diseased or dead branches. May 26, With a California lilac, it is ideal to dead head your tree, when you notice the old blooms wither and die. Removing them will help next year’s blooms appear vibrant and fresh. This is most often done in late spring to early summer.

Grasp the lilac bloom gently, where the flower just meets the stem.5/5(1). 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.