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Apr 02, If lilac bushes are already too large or becoming unsightly, however, pruning the entire bush or tree to about 6 or 8 inches ( cm.) off the ground may be necessary.

This is the best time of year for a deeper pruning.

Keep in mind that you may have to wait for flowers, as it takes about three years for them to develop once the entire shrub has been cut. When to Trim Lilac BushesMissing: Strasburg VA. 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 shrubdelimbing.buzzg: Strasburg VA.

Cut off all of the lilac bush's branches that are broken or show obvious signs of disease. They are more likely to cause problems than to produce a lot of shrubdelimbing.buzzg: Strasburg VA. 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.

They have developed an overgrowth of thorns.

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 shrubdelimbing.buzzted Reading Time: 4 mins. Jun 19, First of all when you cut the flowers for your vase you are actively pruning the bush and this stimulates new growth for next year.

When pruning lilacs, it is generally better to cut the entire shrubdelimbing.buzzg: Strasburg VA.