Arapaho Crape Myrtle Tree

I have an Arapaho Crape Myrtle tree and it was doing well when I first planted it but now the leaves are turning brown. I would like to know what I should be doing to prevent this. Thank you.

Anne's response:

Leaves on Crepe Myrtles turn brown for several reasons. There are some root rot diseases, the plant may be too dry or too wet, the soil may be too alkaline or if the plant is recently planted the roots may not have been watered in to make good contact with the soil around the roots.