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In general, by the time a stem reaches more than 2 inches in diameter.

Apr 02, How to Prune Lilac Bushes. When pruning lilacs, cutting back the tops of overgrown stems is oftentimes not enough. It is generally better to cut the entire stem. Trimming lilacs is best accomplished using clippers. Remove spent blooms all the way to the stems to prevent seeding and encourage more blooms later on. Cut back about a third of the branches. Jul 08, There are two approaches you can take.

The less drastic approach to getting an overgrown lilac back into shape is to use the third rule. Prune a third of the oldest branches all the way to the ground each year for three consecutive years. 1  Start by taking out the thickest stems first. May 01, To ensure abundant flowering, cut off all spent blossoms each year and prune the flowering stem back to a set of leaves, thus preventing seed formation.

If this is not done, good flowering years may be followed by bad years. Since flower buds are formed the summer before they bloom, winter pruning will remove them. Jun 26, Lilacs bloom on newer growth, so the blooms will be on the new younger branches growing out from older trunks. Therefore as the bush gets older and older and puts out more and more new branches, since it blooms better on those newer branches, gradually the blooms are all way up high and unreachable to gather for treeclearance.buzzted Reading Time: 4 mins.

Mechanical Removal. The first step in removing a lilac is to cut down the exposed portions of the plant. Depending on the size and age of the shrub, a pair of sturdy pruning shears and a small limb saw can remove the above-ground vegetation, leaving small stumps near the surface of the soil. Advertisement. Jun 11, Cut bush and dig out soil around root system and chop as necessary to get stump beneath soil level.

Brush cut surfaces with herbicide. Cover with soil. Jun 18, Cut off branches that are crossing and rubbing each other.

Cut off at least most of the more horizontal branches that are growing in towards the center. You want to open up the center so that light/air/water get to the ground and all the parts of the plant. Then take a saw and cut off a couple of the biggest, oldest stems at ground level.