Wife and I planted this Autumn Blaze maple in March and it's starting to get dis colored and turn yellowish. I did water one hour per week for almost 2 months. I felt the soil about 6 inches down and it feels moist. I have not watered the tree in two weeks because I fear I may have over watered. Also, here in north Texas the soil has a lot of clay in it. Does anyone have any ideas or does this tree look okay??