Try to coincide fertilizer applications with pruning. If possible, use a slow release fertilizer that provides proper soil nutrients over a two to three month period. It is important to maintain proper soil moisture levels after fertilization. Garden centers will have many crape myrtles in May and June. Most varieties also have exfoliating, colored bark.
Crape myrtles have a shallow, fibrous root system and are long lived.
For best preformance, plant in a sunny location that has good air circulation and a well drained soil. Crape myrtles require 8 hours of full sun daily for optimum flowering. In partial shade, flowering will be reduced and plants are more susceptible to leaf spot disease. Apply in early spring. For trees in established landscape beds, apply fertilizer in drilled holes or broadcast over the top of the soil.