Clementines are entirely the fruit of human ingenuity. They first appeared in Algeria in the late 19th century, as a result of crossing a sweet orange with a mandarine. They differ from the latter in that they have no pips, are easy to peel and have a sweeter taste. In addition, they can be kept for longer, a fact which soon made them very popular. They need a cool, sunny climate to grow and must be sheltered from the wind. The branches must be pruned regularly for sustained production.