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There are two approaches you can take.

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.

Fortunately, rejuvenation pruning can revive an old lilac in about three years' time.

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. 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. You might need a sharp saw to cut them down. Remove the Old Wood: Remove the old wood every year. As the plant grows, the amount of wood increases. The wood, if not removed, creates a visible hole in the center of the lilac bush.

Allow the new shoots to cover this hole, and replace the old shrublop.buzzted Reading Time: 4 mins. 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 shrublop.buzzted Reading Time: 4 mins.

Jun 14, Take several cuttings to increase your chance of success. Take cuttings in the morning when the weather is cool and the plant is well-hydrated. Cut 4- to 6-inch lengths ( cm.) of tender, new growth. Strip the bottom leaves from the cuttings, leaving two to three leaves at the top.