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Fall Pruning

It’s time to give your landscaping shrubs one last light cut.  Pruning should end 10-12 weeks before the last frost date to allow new growth to harden off.  The last frost date in Middle Tennessee is generally October 15th, so counting back 10 weeks puts us right at August 6th.
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Pruning too late will stimulate plant growth and an early freeze, while that growth is still tender, will kill the young tips.  This could lead to more die-back, and set the plant up to be more susceptible to disease.

Stimulating growth by pruning can also interfere with the plant going into winter dormancy which can make it more likely to be damaged by cold.    Cold damage can cause branch die-back, basal cankers and even death.
Don’t prune spring flowering shrubs (azaleas, dogwoods, forsythia, etc) in the fall.  These plants have already set buds so you would be cutting off next springs flowers.  As a general rule, plants that flower BEFORE July 1 should be pruned AFTER flowering.  Plant that bloom AFTER July 1 should be pruned in late winter or early spring.

Trees and other herbaceous plants may be best pruned in late winter or early spring while the plants are dormant and before buds begin to swell and open.  Do not prune when temperatures are below 20 F.

For more information see the UT Publication “Best Management Practices for Pruning Landscape Trees, Shrubs and Ground Covers" here:  UTPB1619.

More Questions?  Master Gardeners of Rutherford County will be happy to answer your garden-related questions here:  Ask Us!
By: Linda Lindquist, CMG - 8/10/2012
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Programs in agriculture and natural resources, 4-H youth development, family and consumer sciences, and resource development. University of Tennessee Institute
of Agriculture, U.S. Department of Agriculture and county governments cooperating. UT Extension provides equal opportunities in programs and employment