Q.lilac bushes
When is the best time to trim lilacs and how much can be trimmed off?
Downtoearthdigs
Answered on July 30, 2015
I would not prune it back by more than 1/3 in any one year. Cutting it back further than that could harm the plant. This article should help with that: https://www.gardeningknowhow.com/ornamental/shrubs/lilac/pruning-lilac-bushes-when-to-trim-lilac-bushes.htm
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