You may think it is not possible to grow fruit indoors. I just harvested my first grapefruit from a tree that I have had for about two years. In my zone 6 yard I have to keep it indoors most of the year.
My key lime produced for the first time and I have picked lemons from my lemon tree. One of my lemon trees was purchased two years ago the other one I have had for many years and have moved from Utah to Alaska and back again.