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There are two approaches you can take.

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.

Jun 23, Shrubs that bloom later than spring usually form flowers on their current year’s new growth; these are best pruned before new growth begins in spring, or in late fall/winter when they are dormant. Some of these are roses, Buddleia, Clethra, honeysuckle, hibiscus, Hydrangea paniculata & arborescens and bushlop.buzzted Reading Time: 3 mins.

Jul 08, The time to prune mature lilac plants is just after the flowers have faded in the spring. Lilacs set next season's flower buds almost immediately, so late pruning will mean sacrificing the next year's flowers.

  Pruning early also gives new shoots more time and energy to develop, ensuring plenty of blooms for the following spring. Jun 19, Knowing when to trim older lilac bushes is important. Most lilacs don’t require pruning until they reach about 6 to 8 feet tall.

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. Oct 06, You should resist the temptation to prune or trim your lilac bush until it is at least 6 ft. tall, which typically occurs during the second or third year of growth. At this point, there will be enough excess stems and blooms for optimal shaping. Mar 02, When is the best time to prune flowering shrubs and hedges, such as dwarf cork bushes, azaleas, rhododendrons, and lilacs?

- M.S., Mahopac, NY. 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. May 10, Of significantly larger stature is the Japanese tree lilac, S. reticulata, growing 20 to 25 feet high at maturity. This is a pest free, low maintenance tree that grows more attractive with the years.

The cultivar ‘Ivory Silk’ features a profusion of upright panicles of.