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Stop Crape Murder: Don’t Cut Back Your Myrtles

by the Santa Rosa County Extension Service

Proper pruning is one of the most misunderstood of all gardening practices, yet it is one of the most important procedures in a landscape. A common victim of bad, improper pruning is the crape myrtle. Crape myrtles will occasionally need pruning to obtain the desired landscape effect, but many times these plants are butchered for no good reason.

According to Dan Gill, LSU Ag Center Horticulturist, an unfortunate trend in crape myrtle pruning is to lop off their tops, which results in a tree reduced to large branches ending in stubs. The lush growth that occurs at these cut sites appears vigorous but is actually structurally weak and more susceptible to fungus diseases such as powdery mildew. And when pruning is conducted improperly over several years, unsightly large, swollen knobs form at the point where pruning is done each year.

Flowers are not the only virtue of this tree. Many varieties have beautiful bark and growth habits that can be enjoyed all year if trees are not heavily pruned.

Crape murder

This unsightly, ugly pruning known as crape murder is not recommended. Once it’s done, it ruins the tree’s graceful natural shape for the rest of its life.

Often gardeners think they are supposed to prune their crape myrtles that way, and nothing could be farther from the truth. Many think that crape myrtles need to be cut way back to bloom well. This is not accurate. The flower clusters may be larger on lopped trees, but the added weight on the ends of long branches causes them to bend over awkwardly, especially after it rains. And since the tree is smaller, it actually produces fewer flower clusters.

Many people say they need to cut a crape myrtle back because of its size. If the height of the crape myrtle is not causing a problem with a nearby structure or power lines, there is little reason to reduce the tree’s height. To cut a crape myrtle back for the vague reason of “it just seems too large” ignores the fact that these plants are trees. They are supposed to be large.

To prune a crape myrtle properly, first decide if it needs to be pruned. As with any pruning project, you must have a specific, valid purpose in mind before you begin. In other words, if you can’t come up with a good reason to prune your tree – leave it alone. If you do see something that calls for pruning, study the tree carefully and determine what needs to be pruned to accomplish the specific purpose identified.

There are a few valid reasons for pruning a crape myrtle. One reason is to eliminate crossed and rubbing branches because rubbing branches can lead to open wounds.

Over time, branches that are too low on the trunk will need to be pruned to raise the canopy. We often need to remove weak, thin branches from the inner part of the tree to produce a cleaner-looking tree. Selected branches may need to be pruned back to a side branch or the trunk to create a shapelier tree. Of course, you need to prune to keep suckers removed from the base of the trunk.

Generally, avoid cutting back or shortening branches much larger than your finger, although cutting larger branches back to a side branch or to the trunk when needed is fine.

Visitors to our area often marvel over our crape myrtles. During summer, their colorful flowers, attractive bark and beautiful shape make them among our most valuable landscape plants. Please appreciate this – and stop the unfortunate trend of hacking them back.

Pictured top: Crape myrtle trees do not need pruning  for new growth. Pictured below: These Crape myrtles were ruined with unnecessary topping. Submitted photos for NorthEscambia.com.