When is the best time to cut back a lilac bush?
by
Susan Lacina
+7
Lilac bush getting to tall! After flowering can I cut back?
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immediately after flowering has stopped
Yes. Cut it back by 1/3, not from the top, but cut the entire oldest or deadest trunks so that younger shoots can grow.
Cut after flowering.
https://www.gardeningknowhow.com/ornamental/shrubs/lilac/pruning-lilac-bushes-when-to-trim-lilac-bushes.html
After it flowers
Wait for the blooms to die off and then cut them back to a good height.
Yes you can trim it back at least one third.
Cut the bush right after it finishes blooming
Absolutely, that's the best time since next year's blossoms will be on the new growth. Also remove any parts that are 1 inch or larger.
after flowers are gone