Proper Pruning of Crepe Myrtles

Crepe myrtles are sun-loving ornamental trees and shrubs found throughout the southeastern United States and are beloved by everyone. Unfortunately, the proper pruning of crepe myrtles is seen less and less — more often seen are butchered myrtles. While most people prune their myrtles during winter, the butchering often begins before summer is over.

Crepe myrtle trees have beautiful spreading canopies and provide shade for an underplanting of impatiens and shade-loving bedding plants including perennials, foliage plants such as liriope and hosta, and a variety of ground covers. They also can be underplanted with sun-loving bulbs because the bulbs usually bloom prior to the trees getting their leaves.

Crepe myrtles lose their leaves in winter, so any necessary pruning should be done during late winter or very early spring. Note that I said necessary pruning, not butchering.

Here are four (and only four) reasons to prune a crepe myrtle tree:

• to remove dead wood, more commonly called "deadwood;"
• to remove limbs and twigs that are growing back toward the center of the tree;
• to remove limbs that rub against each other; and
• to remove small, low-hanging limbs that will one day hang out over a walkway, path, or lawn.

Removing Dead Wood

Dead wood can be removed at any time of the year. Pruning of living material can be done in late winter or early to mid-spring after the danger of freezing temperatures has passed. Pruning encourages new growth, and pruning during a freeze should be avoided because:

1. A freeze would kill any new growth.
2. This plant blooms only on new growth.

To cut in late spring would be to remove flower buds. Crepe myrtles may also be pruned in summer after blooming is finished. In fact, by pruning immediately after bloom heads are spent, you can obtain a second bloom cycle.

Any limbs and twigs that are growing back toward the center of the tree should be removed, as well as any that touch other limbs. This is done in order to prevent damage to the bark which may be caused by the limbs rubbing against each other on windy days. If two limbs are allowed to continue touching or rubbing together, they will eventually "fuse" together.

If your crepe myrtles have any small limbs that will eventually hang out over a walk, path, or lawn as they grow larger, consider removing them now. This will prevent causing people to have to bend to walk under them, for example, when mowing grass. It is much easier, as well as less traumatic for the tree, to remove the limbs before they grow large.

Cut at the Junction of Two Branches

My tree pictured above was badly damaged by a person who did not know how to prune anything. The red line drawn on the stump shows where the cut should have been made for that branch. If made at that point, it would heal nicely. If left like this, with the bark ripped away from the raw wood, it would have been only a matter of time before disease and pests invaded the tree. To prevent further damage, I had to clean up the "work" of someone else and make additional cuts at the proper place.

Cut at a Steep Slant

The cut should be made on a steep slant so that water will run off and not sit and soak into the raw wood which can cause rot and decay. This is why fence posts are pointed, sloped, or rounded.

"Crepe Murder" is the name given to the act of cutting crepe myrtle trees back to only a few tall stumps. After being cut back so severely, the new growth becomes tightly arranged and will produce knotty bumps. If cut back in this manner year after year, the tree will appear terribly deformed (as shown below).

Although leaves and blossoms will hide the damage on trees that have been butchered, you can easily pick out a tree that has received this treatment from one that has not. In winter while the trees are bare, they look hideous. When crepe myrtles that have been severely pruned finally put out new growth, they resemble short, squatty trees with butch haircuts.

Crepe myrtles come in shrubs and standards. Shrub myrtles will grow to a height of several feet, but will never look like a tree. A standard is a crepe myrtle that will become a small ornamental tree, but small is relative — they are small only when compared to large, majestic trees such as oaks, or when butchered. The standards can grow quite large, so they should be planted with an eye for the future. Unless they have plenty of space, they will need pruning from time to time. As discussed above, there is a proper way to prune these trees and another way that will ruin the shape forever.

Why Purchase the Shrub Type of Crepe Myrtle?

People who want their crepe myrtle to stay small should purchase the shrub type and stay away from standards which are intended to become trees.

The Natchez is one of my favorite cultivars of crepe myrtles because of its spreading canopy, great height (for an ornamental), and large clusters of snow-white flowers. It grows to over 30 feet in height with a top spread of about 15-20 feet in diameter.

I installed two Natchez crepe myrtles in front of our home near Charlotte, North Carolina, where we lived for almost nine years. The canopy of the two trees grew together and provided nice shade for our front door. When they bloomed in mid-to-late May through June or early July, they were like two giant, graceful snowballs.

The bark of crepe myrtles varies; some have smooth bark, mottled bark, or exfoliating bark. The color of bark also varies among the different types of myrtles, and ranges from light sandalwood to silvery-gray and dark cinnamon. The color variations and peeling bark of crepe myrtles and other trees add textural interest to the winter landscape. The photo below shows the exfoliating, cinnamon-colored bark of the Natchez cultivar.

For a list of the names, flower colors, bark colors, height, width, and shape of crepe myrtles, Clemson University Cooperative Extension Home and Garden Information is a wonderful source.

Some people spell the word crepe with an "a" (crape), presumably because the first "e" is pronounced as an "a." This is an anglicized pronunciation of a French word. In the South, we spell it crepe—the same as in crepe paper. Gardeners debate among themselves about this ongoing distinction.

Thank you for reading my gardening article. I hope you will take to heart the pleas of many gardeners not to commit "crepe murder." Please leave your comments to let me know you dropped by for a visit.