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Prune any branches that rub, cross over another branch or interfere with the overall shape of the French lilac. Use pruning shears for branches with a diameter under ¾ inch and lopping shears on. May 26, Lilacs bloom in the spring and you’ll want to prune your lilac tree two times per year: during the winter months and then following its lovely spring bloom.

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.

When you prune a tree or plant, you are removing branches and stems which will help your lilac tree 5/5(1). Aug 21, Answer: It all depends on what you want to prune and why. If you simply want to remove the seed capsules from a common or French lilac (Syringa vulgaris), go ahead but cut only the leafless stem at the tip of the branch that carries the capsules, not the secondary branches just below, the ones with green stumpcut.barted Reading Time: 2 mins.

Apr 27, If the lilac is not grafted you can cut the entire plant off at the ground but don’t expect any blooms for a couple years. Pruning to the ground is the most drastic method but it does work. Less intense renovation prune You can also do a renovation prune over a 3 year stumpcut.bars: Jul 19, Remove one-fourth to one-third of your tree's largest stems using a pair of pruning shears or clippers, according to Russell Tree Experts.

Do this each year after lilac.

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.