If you trim the branches that have started bearing buds, you.

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. A second way to prune old lilacs is to cut back the overgrown shrubs over a three-year period. Begin the procedure by removing one-third of the large, old stems at ground level in late winter. The following year (again in late winter), prune out one-half of the remaining old stems. Also, thin out some of. Jun 19, Most lilacs don’t require pruning until they reach about 6 to 8 feet tall.

The best time for pruning older lilac bushes is right after their flowering has ceased. This allows new shoots time to develop the next season of blooms. Pruning too late can kill young developing bushfelling.barted Reading Time: 3 mins. Pruning of the old flowers, shoots, suckers, runners, and leaves aid in better aeration of the lilac plant, and also promote new growth on it.

Generally, old branches are woody and hard. You might need a sharp saw to cut them down. Remove the Old Wood: Remove the old wood every bushfelling.barted Reading Time: 4 mins. When lilacs are old and unproductive, it's time for a rejuvenative pruning.

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After flowering, cut out all dead, diseased and weak branches with lopping shears or a pruning saw. Cut out any branches. 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 fact, I had none anyway.