When is the best time of year to cut back old lilac bushes?
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immediately after flowering
I do mine both spring or fall ,since any time you do it it'll effect the blooms for a year. Also I was told you want to choose 3-5 of the largest around and cut them off all the way down at the ground. You don't want to shave off the little shooters or the tops as new growth is key for lots of blooms.....
My favorite fkowerung bush! Knowing when to trim lilac bushes is important. Most lilacs don’t require pruning until they reach about six to eight feet tall. The best time for pruning lilac bushes is right after their flowering has ceased
Read more at Gardening Know How: Pruning Lilac Bushes: When To Trim Lilac Bushes
https://www.gardeningknowhow.com/ornamental/shrubs/lilac/pruning-lilac-bushes-when-to-trim-lilac-bushes.htm
https://hortnews.extension.iastate.edu/1993/2-10-1993/lilac.html
Cut no more than 1/3 of the bush in any given year, cut after it finishes blooming
Hi there, here's a great article and video that will show you how and when to prune your lilac bush https://www.thespruce.com/pruning-lilacs-how-and-when-to-prune-lilacs-1403004
Hello, it's best to prune your lilacs in early summer. Once a lilac bush is more than two years old, it requires annual pruning. The best time to grab your clippers and get to work is in early summer, after the flowers have bloomed and faded