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Make sure the soil stays close to basic, and when the bloom is done, prune.

Jun 21, What you don’t want to do right now is to when to trim korean lilac bush often take a few years before they bloom but just in case yours might have a few blooms next year, you don’t want to cut those off. The best thing is to just let the plant go dormant for the bushclear.buzzted Reading Time: 3 mins. Sep 21, Cut branches back selectively to shape the dwarf lilac bush as desired, removing no more than one-third of any stem and making a clean cut just above a bud facing in the desired direction.

Cut one or two of the lilac's oldest stems back to the base of the plant if the shrub is several years old and becoming bare or scraggly looking at the base. When to prune Dwarf Korean Lilac Trees. I have three beautiful Dwarf Korean Lilac Trees (not shrubs) which have trunks about 5 inches in diameter and crowns up to 7 feet in diameter. A local landscaper said I should trim them back in the Fall using a hedge trimmer to shape it, i.e., pay no attention to branch structure.

Apr 02, The best time for pruning lilac bushes is right after their flowering has ceased. This allows new shoots plenty of time to develop the next season of blooms. Pruning lilacs too late can kill young developing buds. Jul 08, Start by taking out the thickest stems first. Although you'll be losing some flowers for the current year, pruning overgrown lilacs is easiest early in the spring before the branches leaf out.

After three consecutive years of pruning your overgrown lilac. As soon as the lilac bush's flowers are dead, trim each flower stem back to the leaves, removing all trace of the flowers. This step stops the lilac from using its energy to make seeds. Remove lilac blooms from the bush when they start turning brown. Trace the flowering stem back to where horizontal shoots emerge from it.

Cut the flower off just above the first set of horizontal branches, using hand pruners. Aug 15, The Korean lilac does not grow fast, so it isn’t necessary to trim it every year. But after it has reach full blooming during the spring and summer season, you should remove and withered and old foliage and flowers.