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The Best Time to Trim Trees and Shrubs

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While every tree and shrub needs a trim once in a while, gardeners who use their shears at the wrong times may damage their plants. Only a well-timed pruning will enhance the health and appearance of a tree or shrub.

Timing

Young trees need regular trimming to train them to grow correctly and remove unhealthy branches. Late winter or early spring—from late December to early April—is the best window of time to prune trees and shrubs for appearance.

Significance

Trimming trees and shrubs in late winter encourages them to sprout new growth in spring for healthy, lively blooming. Trimming at other times—such as in the fall—may cause new growth that will remain too weak to survive winter frost.

Exceptions

Plants with diseased limbs may need immediate trimming to prevent the disease from spreading. As long as the weather is dry, this kind of trim is safe any time of year.

Trim Shrubs?

Winter is a busy pruning season. According to “Sunset,” it is an ideal time to trim woody shrubs to keep them from becoming leggy during the growing season. It grows 1 1/2 to 2 feet tall and blooms from August through September with white flowers. According to the University of California Alameda County Master Gardeners, winter is also a suitable time to prune butterfly bush (Buddleia davidii), California fuchsia (Zauschneria californica) and roses. Wait to prune shrubs that could be damaged or killed by a late winter or early spring frost. For frost-tender plants, the extra branches and growth protects them cold weather damage. Green velvet boxwood is hardy in USDA zones 4 through 9, and it should be pruned after its spring flush of growth has finished to control growth and maintain hedge size.

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