Because pruning stimulates new growth, late summer and fall pruning are.

Pruning Methods for Flowering Shrubs The primary objective in pruning flowering shrubs is to encourage new (flowering) growth from the base. This is best accomplished by thinning at the base or rejuvenation. Branch by Branch Shaping With branch to branch shaping, shorten the length of excessively long branches by cutting them back one-by-one.

Prune summer-flowering shrubs in late winter or early spring. The pruned shrubs will bloom in summer on the current season's growth. Some deciduous shrubs don't produce attractive flowers. These shrubs may possess colorful bark, fruit, or foliage. Prune these shrubs in late winter or early spring before growth begins.

This method of heading back is generally used on slower growing, often single-stemmed shrubs, like fragrant viburnums and rhododendrons.

Do not prune deciduous shrubs in late summer. Pruning shrubs in August or early. Apr 23, The best time for pruning depends upon the plant.

Trim early-spring flowering shrubs right after they bloom. Clip summer flowering plants in winter or early spring. Trim nonflowering plants Estimated Reading Time: 3 mins. Prune spring flowering shrubs (lilacs, snowball bush, spirea, viburnum, forsythia and others) within a week of when they quit blooming.

Below is a list of common landscape trees pruning early flowering shrubs when to prune them, primarily taken from the American Horticultural Society’s Pruning and Training book. Ash - Late autumn to midwinter when fully dormant.

Apr 20, DO Prune Flowering Shrubs at the Right Time of Year Spring-flowering shrubs, such as lilac and forsythia, develop buds that will display the Estimated Reading Time: 5 mins.