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Apr 02, If lilac bushes are already too large or becoming unsightly, however, pruning the entire bush or tree to about 6 or 8 inches ( cm.) off the ground may be necessary. Keep in mind that you may have to wait for flowers, as it takes about three years for them to develop once the entire shrub has been cut.

When to Trim Lilac Bushes. Knowing when to trim lilac bushes is important. Most lilacs don’t. Jun 19, The best time for pruning older lilac bushes is right after their flowering has ceased. This allows new shoots time to develop the next season Estimated Reading Time: 3 mins. Of course, you can prune in the fall if absolutely required. Can you cut a lilac bush to the ground? Most lilacs don't require pruning until they reach about six to eight feet ( m.) If you are pruning lilac trees or shrubs entirely to within inches of the ground, it is best to do so in early spring.

Fertilizer - Your soil may be at fault too.

Jul 08, When to Prune Lilac Bushes Many of the newer lilac varieties grow quickly and might need pruning starting in their second or third year.

In general, by the time a stem reaches more than 2 inches in diameter, it should be pruned. 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.