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Apr 28, To prune your lilacs, start deadheading in early-to-late spring by cutting the flowers at their base just after they’ve reached their peak. You should also cut any flowers that are already dying so they don’t sap energy that could be used for new growth%(4).

Remove the Old Wood: Remove the old wood every year. 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. If the plant is new, light pruning will be enough. Prune out some of the suckers and remove any tangled branches or leggy limbs. Reduce by a third. Over time and as the plant ages, the interior may become congested with a tangle of older limbs. Lilacs will bloom reliably for years with minimal care, but some older plants may become less productive. Don’t shear them as you would a hedge. Lilacs are not meant to have this sheared look, and don’t have the branch structure leant to this.

Rather, prune each major branch back to a side shoot. Remember, as with pruning any shrubs or trees, the shoot or bud just below where you prune will grow out in the direction it is pointing. Jan 09, You can prune the entire plant back 6 to 8 inches from the ground. This is a very dramatic method and you won’t most likely not see blooms for 2 years but it works.

Note: Check to see if your lilac has been grafted. Check the main trunk of the Lilac and see if there is a bump and difference in the bark. That would be the graft union. Mar 02, Early spring, before growth begins, is an ideal time to prune flowering shrubs and ornamental shrubs, especially those grown for their foliage rather than their flowers. Shearing or pruning evergreen hedges such as arborvitae, yew, and boxwood shapes them and encourages new growth, for a denser appearance.

Deciduous plants used for foliage, such as cork bush (Euonymus alatus) and.