Hi, I just purchased my first dwarf lisbon lemon tree two weeks ago and noticed that there are a few leaves that have white and brown spots on them already. I have it sitting on my back patio directly in the sun. I was told that this type of tree can handle direct and indirect sun. Does anyone know why this would happen so soon? I have the worst luck with nature. No green thumbs this way!! I want this tree to be happy. What could be the problem? Please guide. Thanks!