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To get the most flowers from a lilac bush, prune it.

The best time for pruning lilac bushes is right after their flowering has ceased. If you are pruning lilac trees or shrubs entirely to within inches of the ground, it is best to do so in early spring. New shoots will develop during the regular growing season as long as there are a few healthy shoots left. 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. Lilac bushes bloom only once each year, in spring, but they make new buds after they bloom. The buds become the next year’s flowers. If you trim a lilac bush too late in the year, then you’ll cut.

Mary: Your lilac-loping tale of woe illustrates the serious negative long-term effects Fall pruning can have on the health of plants. Jul 08, The plant will begin to bloom all over, and you can do regular maintenance pruning from that point on. 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.

Nov 17, Thus, if you prune at any time other than immediately after flowering, you will cut off next year's blooms. For lilacs, the recommended method is generally to remove one third of the old wood each year immediately after flowering and shape the shrub over a number of seasons.

Of course, you can prune in the fall if absolutely required. Keep in mind, though.