Crepe Myrtle is a beautiful summer flowering tree/shrub. It is often thought of as a southern plant that is not able to be grown here which is not exactly true. When planted at the right location and protected from winter cold, it does well in our climate. However, it normally stays more of a bush.
The plant will only flower during a warm, dry summer.
Lighting
Full sun, and plant in a protected area if possible. Expect the plant to reach approximately 4-7’ tall with slightly less spread.
Watering
Frequently in spring, moderately during the rest of the year. Reduce watering in winter and just before flowering to encourage bud formation.
Feeding
Every two weeks in spring-autumn. Alternate a general-purpose plant food or bonsai food with a low nitrogen tomato fertilizer.
Pruning and Wiring
The crepe myrtle flowers at the ends of its shoots, so one must take care with pruning if flowering is desired. The safest method is to prune only in autumn, and in any case, a good autumn pruning will stimulate bud production for next year. We recommend cutting the crepe myrtle back severely, then allowing it to grow freely for a year to thicken the trunk. The next year, pinch the tree constantly to promote branch ramification. If pruning is discontinued shortly before the flowering period, it may still flower. May be wired from spring to autumn, taking care to protect the bark. The branches are delicate, however, and it is just as easy to shape through pruning due to the excellent branch ramification.
In the late fall, put a burlap or chicken wire fence about 2’ in diameter and 2’ tall around the base of the plant. Stuff the area with leaves or straw so it helps to insulate the plant from the cold. In spring, take away the fence and leaves. Give the Crepe Myrtle time to push out new growth—it is one of the latest plants to push new growth. Crepe Myrtles grow rapidly and flower on new growth, so even if the plant dies to the ground, it will still grow and bloom that year.