The best time for pruning lilac bushes is right after their flowering has ceased. If you are pruning lilac trees or shrubs entirely to within inches of the ground, it is best to do so in early spring. New shoots will develop during the regular growing season as long as there are a few healthy shoots left. Lilac bushes bloom only once each year, in spring, but they make new buds after they bloom.
The buds become the next year’s flowers. If you trim a lilac bush too late in the year, then you’ll cut. Mary: Your lilac-loping tale of woe illustrates the serious negative long-term effects Fall pruning can. 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.
Apr 28, To prune lilacs, get to work in the spring: cut fresh flowers for bouquets, nip off the longest stems, and thin out any weak stems at the base. Avoid pruning late in the summer or fall since doing so can limit future growth%(4). Jul 08, The plant will begin to bloom all over, and you can do regular maintenance pruning from that point on. If you can't stand the look of your old lilac or you just want a quicker approach, you can take the drastic measure of cutting back the entire plant.