I received a white spruce as a gift last year and it has been in a pot and indoors since I received it. Recently I have noticed that some of the needles have turned brown at the base and that some random needles are browning from the tips inward. It sits in front of a window that gets 5 hours of afternoon sun 1pm- 6pm. I believe the tree is only a year old. I was wondering if this browning is natural as the tree grows or is something more serious going on.