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Iowa State University Extension.

Apr 02, The best time for pruning lilac bushes is right after their flowering has ceased.

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This allows new shoots plenty of time to develop the next season of blooms. Pruning lilacs too late can kill young developing buds.

If you are pruning lilac trees or shrubs entirely to within inches of the ground, it is best to do so in early spring. Dec 10, Whenever possible, avoid pruning the lilac in summer, fall or winter, because the lilac blooms on growth produced during the previous growing season.

If you trim a lilac bush too late in the year, then you’ll cut off unwanted branches and next year’s blossoms. The ideal time to prune is just after the bush finishes blooming for the year.

Carry on with maintenance pruning.

We do it by leaving the shrub 6" shorter after the spring pruning than we want it to be at bloom time the following spring. Year three and beyond: To keep a dwarf lilac small, start out by accepting that it has the potential to be as big as those at the very top of this page and that you must prune it regularly. Jun 19, The best time for pruning older lilac bushes is right after their flowering has ceased. This allows new shoots time to develop the next season of blooms.

Pruning too late can kill young developing buds. Deadheading, should be done as soon as possible after the flowers bushcutting.buzzted Reading Time: 3 mins. May 20, New lilac bushes don't require maintenance pruning until they are about 6 - 8' tall. The time to prune mature lilac plants is just after the flowers have faded. They set the next season's flower buds almost immediately, so late pruning will mean sacrificing next year's flowers.

Jun 03, Pruning lilacs is best done within a few weeks after the blooms fade. Trim them with bypass pruning shears, cutting blooms off just above the place the stem forks beneath the bloom.

Old growth should also be cut back every few years to help keep.