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. 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 Bushes. Unless plants have unsightly or broken branches, you can usually not bother with pruning until your plants are ten years old or more.
If your plants are six to ten feet high, maybe the same across, with older wood (thick branches, distinct bark like a tree), or perhaps branches that cross and rub on each other, you may think about pruning.
Jun 01, Pruning to meet these challenges can be a different approach than with many other flowering shrubs. Common lilac (Syringa vulgaris) can grow anywhere between 8 and 20 feet tall and wide, depending on its cultivar. If it is given plenty of space, pruning may not be necessary outside of occasional deadheading and shrubcleanup.buzzted Reading Time: 7 mins.
Jul 08, Consistent with its tree-like shape, these plants should be pruned in the same manner that most small trees are handled. Prune to maintain an open interior and several main branches that form a vase shape. Japanese tree lilacs generally require little, if any, pruning until they are about 3 years old.
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