Trim them accordingly.

Apr 02, The best time for pruning lilac bushes is right after their flowering has ceased. This allows new shoots plenty of time to time of year to trim lilac bush 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. 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. 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, Prune 1/3 of the oldest branches each year, all the way to the ground.

Start by taking out the thickest stems first.

If you are diligent and mindful about pruning, you can expect the lilac bush to reach 8 ft.

Although you'll be losing some flowers for the current year, pruning overgrown lilacs is easiest early in the spring, before the branches leaf out. You can really see into the shrub and there is easier access to the base of the stems. Jun 19, Most lilacs don’t require pruning until they reach about 6 to 8 feet tall.

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 of blooms.

Pruning too late can kill young developing shrubdisposal.barted Reading Time: 3 mins. Oct 06, You should resist the temptation to prune or trim your lilac bush until it is at least 6 ft. tall, which typically occurs during the second or third year of growth.

At this point, there will be enough excess stems and blooms for optimal shrubdisposal.barted Reading Time: 6 mins.