Crepe Myrtle Plant. Plant crape myrtle in the fall or early spring. The plant should establish the root system before the frost arrives (if planted in fall) or summer heats hits (if planted in spring).
Since you are interested in crape myrtle for the blooms, what do you look for when choosing a plant? Planting indica crepe myrtle in fall is recommended to encourage root formation, but you can still plant over the winter until spring, even though you must absolutely avoid any period of freezing. They are great plants to plant just before the start of the cooler season.