This past spring I planted an Arapaho crape myrtle tree in my yard. The tree seemed to take well and grew quite a bit. However about 2 months ago it started to drop leaves. Before they would drop they turned a reddish tint and then would later fall. I have watered the tree almost daily because we are in a severe drought. I don't notice that happening to other crape myrtle trees in our neighborhood. Does anyone have an idea what is causing this? Thank you for your time.