We planted 7- 65 gallon Japanese Blueberry trees in October 2017. The soil here is clay. Most of the trees have new growth, but the trees have lots of the new/young leaves turning red and then dropping. My understanding is the leaves that are 2-3 years old are the ones that turn red and then drop in the fall. Is this normal for recently planted trees or is this a sign that the trees need something. What should I do?