Since old stems produce flowers, you want to keep many around.
Pruning lilacs soon after flowering has finished removes unsightly spent blooms. Shortly after bloom is also the best time to prune the lilac for shaping and rejuvenation, as the lilac begins to.
Jun 26, Timing is the Decisive Factor in Pruning Lilacs If you want to have your blooms next year, it is crucial to prune in those first few weeks after blooming ends. Ideally, this is when you would do maintenance pruning each year. But I get so lazy busy, I end up with a ten foot bush with ten blooms Estimated Reading Time: 4 mins.
May 20, To keep your lilacs looking their best, they need to be pruned, fertilized and shaped almost every year, soon after they are done blooming in the late spring. Don’t wait too long, as next year’s blooms start forming in the summer.
You don’t want to cut them off by mistake. Pruning in the winter will remove all the bloom for the following stumplopping.barted Reading Time: 2 mins.