The lemon, Citrus limon Osbeck, is a species of small evergreen tree in the flowering plant family Rutaceae, native to South Asia, primarily North eastern India. Its fruits are round in shape.
 
Shelf Life: 
around three to four weeks
Shelf Life of Lemons
Lemons have a pretty long shelf life, as long as you store them properly. When refrigerated in a plastic bag, lemons will keep for around three to four weeks. This time is shortened to about a week when they're stored at room temperature.