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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. Pruning early also gives the new shoots more energy to develop.

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11y ago
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8y ago

You can trim the tree when the bloom is over and before it sheds its leaves. In the spring, the best time is after the last frost. Water and feed the tree.

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10y ago

after lilac blooms have died and dried, this is the time to prune

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Q: What time of year can you trim a lilac tree?
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