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Pruning Like other spring blooming shrubs, lilacs develop flower buds for the next year after.

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. Newly planted lilacs usually do not need pruning for 2 to 3 years and it will take 1 or 2 years before a lilac blooms.

Years later, lilac stems can grow very large and tree-like and they will tend to shade out new growth at the plant base. Use a lopper or hand saw to remove a third of the thickest stems at the base. If you are pruning lilac trees or shrubs entirely to within inches of the ground, it is best to do so in early shrubremoval.buzzd Reading Time: 2 mins. Jun 30, When to Prune Lilac Bushes.

Many of the newer lilac varieties grow quickly and might need pruning starting in. 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. If you are diligent with annual pruning of your lilac, the shrub will grow to about 8 feet tall with flowers throughout the branches.