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When should I fertilize lilac bushes and what kind should I use?

May 20, When to Prune Lilacs. New lilac bushes don't require maintenance pruning until they are about 6 - 8' tall.

The time to prune mature lilac plants is just after the flowers have faded. They set the next season's flower buds almost immediately, so late pruning will mean sacrificing next year's flowers. You prune an ever bloomer the same as you would a regular lilac.

There are 2 approaches you can take.

They begin developing spring blooms around mid August, so that would be the best time to do it. By doing a little every year you won't loose end of season blooms. Jun 03, Pruning lilacs is best done within a few weeks after the blooms fade. Trim them with bypass pruning shears, cutting blooms off just above the place the stem forks beneath the bloom. Old growth should also be cut back every few years to help keep the bush productive.

Remove diseased or dead branches.