Answer: Lemons can retain green skins for an extended period, so I wouldn't worry about it being a lime. If the fruit is still small (lime size) it isn't ready to be harvested. The rind color is not always a reliable indicator of when citrus is ready to be harvested, as the color changes with the weather. In cool temperatures, lemons will turn from green to yellow. If temperatures don't cool, the fruit can still be ready even if the rind is green. So, wait for the fruit to be the appropriate size and "density" in your hand, rather than relying on it to be yellow.
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