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Apr 28, Suckers are baby trunks growing out from the original plant, or sprouting from the ground close by. Cut these back all the way to the base of the trunk or the ground to prevent them from getting any bigger. Suckers take away energy from the rest of the plant.
A healthy lilac bush 75%(4). While I'd not hesitate to do rejuvenation pruning on a typical common lilac now, one that is grown in a tree form (single trunk rather than multiple stems/canes from the ground) should be treated a bit differently. Too severe a pruning at this time of year might well jeopardize its future, specially in a colder climate.
Sponsored. Jan 09, When pruning this way cut out any dead or weak canes, then cut out 2/3rds of the suckers or shoots coming up at the base, leave 1/3 for future blooming stems. You can actually dig the suckers up and pot them to make more lilacs if you wish, they actually mature faster than taking cuttings and rooting them. Pruning of the old flowers, shoots, suckers, runners, and leaves aid in better aeration of the lilac plant, and also promote new growth on it.
Generally, old branches are woody and hard. You might need a sharp saw to cut them down. Remove the Old Wood: Remove the old wood every year. Nov 17, The best time -- and only correct time, really -- to prune lilacs is just after blooming. All shrubs fall into one of two categories; some, like many of the hydrangeas, bloom exclusively on new wood and can be pruned to the ground each fall if required.
Others, such as lilacs, bloom only on old wood from the previous season.