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Thick lilac stems can be very tough.

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.

When to trim lilac bushes knowing when to trim lilac bushes is important.

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 in early spring. Jul 08, In general, by the time a stem reaches more than 2 inches in diameter, it should be pruned.

If you are diligent with annual pruning of your lilac, the shrub will grow to about 8 feet tall with flowers throughout the branches. The time to prune mature lilac plants. Jun 19, Knowing when to trim older lilac bushes is important.

The best time for pruning older lilac bushes is right after their flowering has ceased.

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 bushtrim.buzzted Reading Time: 3 mins. Generally, lilacs do not need to be cut back until the plant reaches eight to ten feet tall. The best time for pruning lilac bushes is right after their flowering has ceased. Lilac bushes can get tall and leggy and knowing how to prune them will give you years of beautiful, fragrant flowers on manageable plants.