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Begin by pruning: dead or diseased stems pencil thin suckers and twiggy growth.

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.

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. Jul 08, The time to prune mature lilac plants is just after the flowers have faded in the spring.

Lilacs set next season's flower buds almost immediately, so late pruning will mean sacrificing the next year's flowers.   Pruning early also gives new shoots more time and energy to develop, ensuring plenty of blooms for the following spring. May 20, 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 lilac plant to about" from the ground, again in early spring.

New shoots will start to develop throughout the growing season.

Let. Apr 12, Lilac only bloom in the spring and then remain leafy and green until fall. I was told it is best to trim the blooms as they begin to die. You can trim them back a bit throughout the summer, but for a full trim it is best to wait until fall.

It will grow back nice and full in the spring. Happy bush trimming!