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Cut off Flowers, Shoots, Suckers, and Runners: You would.

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 in this way, new shoots should comprise the bulk of the plant.

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. 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 wood. If the plant is new, light pruning will be enough. But, if they are old, overgrown shrubs and bushes, you need to cut all the unnecessary bushlop.buzzted Reading Time: 4 mins.

Old, neglected lilacs can be renewed or rejuvenated by pruning. Home gardeners can choose between two different pruning methods. One way to renew a large, overgrown lilac is to cut the entire plant back to within 6 to 8 inches of the ground in late winter (March or early April). Jul 14, Trim mature lilac bushes so that they remain within 6 to 8 feet. Aim to have 10 to 12 main stems, each of them 1 to 2 inches thick. Never prune more than one-third of the bush.

When lilacs are old and unproductive, it's time for a rejuvenative pruning. After flowering, cut out all dead, diseased and weak branches with lopping shears or a pruning saw. Mar 26, Remove all old and dead wood, hard prune any remaining limbs to about 2-feet, and thin the suckers to leave only the strongest. Remove the trees entirely and plant something that prefers shade.

In either case, I would have no Lilac blooms in April, but in.