Meyer Lemon Turning black

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Either it didn’t pollinate, it does not have enough nutrients, it’s not watered enough, or it’s a young tree and it knows what it can handle. I have one that I purchased last summer, put it in a large pot with wheels. It had 8-10 small lemons on it when we purchased it and they all stayed on and ripened well in the winter. I put it in the garage on cold nights this winter. This spring, it was loaded with over 40-50 small lemons. Nearly all but 5-10 turned yellow and fell off (they were really small). I fertilize and water it so I know that’s my issue. I just think it knows it can’t handle that much fruit so it sheds it. A lot of books recommend thinning fruit on small fruit trees the first year or two so it can focus on root development.