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Hyacinth Plant

Q.Resizing Old Lilac Tree

Anonymous added on January 9, 2014 | Answered

I have a 30-year old lilac tree that has gotten far too big in the mantle (15/20 ft across) with a height of 20 ft (approx). I want to reduce its size both in height and mantle. How severely can I cut this tree back, and when can I do it? Many thanks.

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Certified GKH Gardening Expert
Answered on January 9, 2014

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 pruning: https://www.gardeningknowhow.com/ornamental/shrubs/lilac/pruning-lilac-bushes-when-to-trim-lilac-bushes.htm

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