Hello, I have a question about a red oak in my front yard. I planted it in the fall of 2014. It is about 12' tall right now. The tree has full light most of the day. I made sure to keep it watered in the summers of 2015 and 2016. This spring, it only got leaves on the branches on the top half of the tree, and one at the very bottom of the branches. I also now see a sucker popping up at the base of the tree. The last two years it had leaves on the majority of the branches. The leaves that are on it now are full and seem to be in good shape. Is this something that I need to be concerned about? Thank you, Peter