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According to the UMN Plant Disease Clinic, in May, we had.

Jul 08, In general, by the time a stem reaches more than 2 inches in diameter, it should be pruned. If you are diligent with annual pruning of your lilac, the shrub will grow to about 8 feet tall with flowers throughout the branches. The time to prune mature lilac plants. Sep 21, Tip. If you have shaped your lilac bush to have one main stem like a tree or prefer an alternative to the three year plan, do one severe pruning in late winter.

Cut the main branch or branches of your lilac to a height of six or eight inches. Jun 17, The lilac may benefit from pruning using the"1/3 method". which is to remove one third of the mature stems to their point of origination each year for the next three years (thereby rejuvenating the entire plant). Afterwards you remove one or two mature stems each season to maintain size and shape.

jimmyq, Mar 30, It is best to remove between 1/4 and 1/3 of the lilac tree’s biggest stems, before it has had a chance to bloom in the spring. You want to keep about a dozen bigger stems untouched.

In the spring after it has bloomed, when you cut it back again, trim your lilac tree to one foot shorter than the height you want it to reach during springtime. Jul 19, Lilacs (Syringa spp.) are shrubs, but these fragrant, spring blooming bushes can get so large that they often resemble small trees. Common lilac (Syringa vulgaris) thrives in. Apr 28, To prune lilacs, get to work in the spring: cut fresh flowers for bouquets, nip off the longest stems, and thin out any weak stems at the base.

Avoid pruning late in the summer or fall since doing so can limit future growth%(4).