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Then prune back the rest of the branches by a foot.

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.

No absolute right or wrong in pruning.

To prune, you can be extreme and cut most lilacs back to near the ground. Over several years they will send up new shoots, but in the meantime they are not attractive. I like to prune back about one third of older branches each year. Jul 08, The plant will begin to bloom all over, and you can do regular maintenance pruning from that point on. If you can't stand the look of your old lilac or you just want a quicker approach, you can take the drastic measure of cutting back the entire plant to about 6 to 8 inches above the ground in the early spring.

HOW TO PRUNE A LILLAC BUSH IN SPRING! Ever wondering what time of year to trim your Lillac bush? OR do you think your Lillac bush looks overgrown? Then this. May 18, To not stress your lilacs, major restorative pruning should take place over three years. After blooms are done in the spring is the time to cut back about a third of the largest branching trunks Estimated Reading Time: 3 mins.

Cut spent blooms off of the lilac with pruning shears.

Repeat the fungicide application in two weeks, or as directed by the manufacturer.

Even out the length of the branches when you remove the dead lilac flowers. Make the cuts at.