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Sound horticultural pruning methods work for native and nonnative plants alike.

Apr 02, How to Prune Lilac Bushes. When pruning lilacs, cutting back the tops of overgrown stems is oftentimes not enough. It is generally better to cut the entire stem. Trimming lilacs is best accomplished using clippers.

Remove spent blooms all the way to the stems to prevent seeding and encourage more blooms later on. Cut back about a third of the branches. 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 have on the health of plants. jea32, I'd wait until after flowering in spring. While I'd not hesitate to do rejuvenation pruning on a typical common lilac now, one that is grown in a tree form (single trunk rather than multiple stems/canes from the ground) should be treated a bit differently.

Too severe a pruning at this time of year might well jeopardize its future.

So don't panic if your lilac isn't as vibrant one year.

Apr 06, Since lilacs set next year’s flower buds right after the current year’s flowers have faded, pruning later in the summer or fall will result in cutting off many or all of next year’s flowers. This rule of timing applies to the larger common lilacs as well as the cultivars that are shorter or more “shrub” like.

Jun 10, Fragrant, colorful lilacs are easy to grow in most regions. Whether your lilac is a shrub or a small tree, it will need to be regularly pruned in order to maintain a healthy shape and size.

To prune lilacs, get to work in the spring: cut Views: K. Nov 17, The best time -- and only correct time, really -- to prune lilacs is just after blooming. All shrubs fall into one of two categories; some, like many of the hydrangeas, bloom exclusively on new wood and can be pruned to the ground each fall if required. Others, such as lilacs, bloom only on old wood from the previous season.

Thus, if you prune.