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.
Dec 10, 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.
S. meyeri grows to about 8', S. chinensis to nearly 15'. So if you want a dwarf lilac to remain less than 8' or a common lilac to be less than 20', plan to prune it regularly. This article is for you if you have an overgrown lilac of any kind: First, to bring it down to manageable size, Then to keep it smaller than it would if left alone.
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.