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Don't prune later in the summer or fall.

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.

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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.

Fertilize the plant with compost or a balanced fertilizer to prompt new growth. Jun 26, Timing is the Decisive Factor in Pruning Lilacs. If you want to have your blooms next year, it is crucial to prune in those first few weeks after blooming ends.

Ideally, this is when you would do maintenance pruning each year. But I get so lazy busy, I end up with a ten foot bush Estimated Reading Time: 4 mins. As soon as the lilac bush's flowers are dead, trim each flower stem back to the leaves, removing all trace of the flowers. This step stops the lilac from using its energy to make seeds.

Mar 02, Deciduous plants used for foliage, such as cork bush (Euonymus alatus) and privet, can be treated similarly. As you cut them back, be sure to shape the plants somewhat wider at the bottom so sunlight can reach the lower branches. For flowering shrubs such as azalea, rhododendron, and lilac, pruning before they bloom removes some flowering buds. Jun 10, This type of pruning goes beyond a lighter annual pruning to severely cut the bush or tree back, allowing for new growth to occur.

I had some problems when I tried cutting.

Do your assessment in early spring, before the lilac has come back to life. This is the best time of year for a deeper shrubtrim.buzz: K.

Apr 12, Pruning right after a lilac has bloomed does allow the new growth to harden, but you still have created an entry point for disease and insects when they are active.

Pruning right after blooming is a compromise that preserves the most blooms versus the risk to a plant%26#;s health. Dec 10, Whenever possible, avoid pruning the lilac in summer, fall or winter, because the lilac blooms on growth produced during the previous growing season. Delaying pruning for more than a. Oct 01, The best time to do that is right after the lilac blooms in spring. (Cutting it now, over winter or early in spring will cut off the flower buds that already have formed.) Cut back to just above.