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Fertilize the lilac in winter after it enters dormancy.

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. 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. 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. 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 with ten blooms on shrubnotch.buzzted Reading Time: 4 mins. Nov 27, When it comes to lilacs, beauty really is in the eye of the beholder.

If a lilac bush has become extremely overgrown, plan on cutting back the plant over a period of three years. Each year after the flowers have bloomed and died, prune one-third of the lilac.

Begin by cutting off the oldest branches first. Should you cut back lilac bushes? Lilacs should be pruned yearly to develop a good framework of stems and promote vigorous growth that enhances flowering.

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Yearly pruning consists of cutting diseased, misshapen, and unproductive stems to the ground. I also thin and remove some stems to encourage properly spaced, vigorous growth.

Why did my lilac bush not bloom this year?