Always in season. Lemon is always in season as the lemon tree flowers year round. Originally from India, it was first brought to the Mediterranean by the Arabs. It is well known that lemon is one of the best sources of vitamin C, and that it saved seafarers from scurvy in the 18th century. The juice of a single lemon meets about 25% of the daily recommended dose of this vitamin. Lemon is chock full of nutrients, and has always been considered a natural antibiotic. It is a popular ingredient in many desserts and cakes, and as the always welcome and refreshing lemonade.