Hi everyone, I'm new to lemon trees. I reached one from the garden centre nearly dead, it grew lovely but now it's stopped growing, the fruit turns black and shrivels before it's grown and now the new leaves that are starting to grow are going hard and brown on the ends, some of the leaves have for brown marks and holes in them, I really want to try and save it. I water it once it dries out, it is in a pot inside the house. I need help