Crape myrtle is a deciduous tree or large shrub native to East Asia and Southeast Asia, planted widely across the southern United States for its extended summer color, attractive exfoliating bark visible through winter, and reliable fall foliage. It functions well as a street tree, specimen planting, privacy screen, or multi-trunk garden focal point and is among the most commonly used ornamental woody plants in zones 7–9.
Full sun and good air circulation are essential; shade and crowding reduce growth and increase powdery mildew pressure. Excessive heading back of main stems to stubs each winter—called crape murder—disfigures the natural branching structure without boosting flowering. Removing only crossing interior branches, sucker growth from the base, and spent seed clusters is sufficient annual maintenance. The plant tolerates drought once established but benefits from consistent watering during the first two growing seasons. Slightly acidic, well-drained soil with a mulch layer over the root zone supports steady establishment. Remove basal suckers as they appear to maintain a clean structure.
The tree provides nesting sites for songbirds and wrens and attracts bees and butterfly species during the long summer season. Traditional Asian medicine has used bark and leaf preparations for fever and skin conditions; laboratory assays have identified antimicrobial compounds in bark extracts, though human clinical evidence remains limited.
Powdery mildew
White or grey powdery coating on leaves — usually starting on older growth in humid conditions or when nights cool.
Improve air circulation by thinning plants. Apply neem oil or potassium bicarbonate spray at first sign. Avoid overhead watering.
Cercospora Leaf Spot
Small round spots with tan or gray centers and reddish-purple borders on leaves. Spots merge in severe cases, causing leaves to brown and die back.
Remove infected leaves and avoid overhead watering. Space plants for airflow and rotate crops. Apply a copper-based fungicide if the infection spreads.
Sooty Mold (Scale-Associated)
Black, powdery or crusty coating on upper leaf surfaces and stems. Affected leaves may yellow and drop in severe cases. The mold grows on honeydew secreted by scale insects, mealybugs, or aphids feeding on the plant.
Control the underlying pest infestation first using horticultural oil or neem oil applied thoroughly to stems and leaf undersides. Once pest populations are reduced, sooty mold stops spreading and weathers away over time. Rinse foliage with a strong stream of water to dislodge existing mold deposits.
Root rot
Plants wilt, yellow, and stunt even in moist soil; lower stems and roots turn brown, soft, and mushy and the plant may collapse. Most common in heavy, wet, or poorly drained ground.
Improve drainage and stop overwatering, and never plant too deep. Lift and destroy badly affected plants along with the soil around the roots. Grow in raised or free-draining beds to prevent it returning.
Botryosphaeria Canker
Dark, sunken cankers on stems and major branches, most often occurring after drought stress or mechanical wounding. Bark peeled back from affected areas reveals brown, discolored wood beneath. Branch tips wilt and die back progressively inward.
Prune infected branches at least 6 inches below the visible canker margin using sterilized tools, and dispose of all cuttings away from the garden. Reduce plant stress by maintaining consistent irrigation during dry periods and avoiding bark wounds during maintenance. No curative fungicide is available; keeping plants vigorous is the primary preventive strategy.