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How To Prune A Lilac Tree. Hard pruning should be done ideally in early spring or late winter. Keep your old lilac tree healthy and vigorous by pruning away some of the old branches every three to five years.
Look out for these appearing through the surface of the soil. Lilacs respond well to hard. If you have any overgrown branches, then you may need to control these with more vigorous pruning.
Read This if You Don't Know How to Prune Lilac Bushes the
Prune young plants to the central stem when dormant, removing all other stems coming up from the soil and all lower branches, to leave just a whip. Every spring, after it blooms, you should clip off all old bloom scapes so they don’t waste energy making seeds. When pruning lilacs, cutting back the tops of overgrown stems is oftentimes not enough. Keep your old lilac tree healthy and vigorous by pruning away some of the old branches every three to five years.