Apples have been a staple of the human diet since ancient times. Their varied shapes, sizes, colours, and tastes provide fruit that is beautiful to the eyes and pleasing to the palate in many forms—fresh, baked, stewed, dried, and in cider, sauce and jelly. When planning to plant apple trees, remember that to ensure pollination and fruit set, two different varieties are required. For example, Idared and Golden Russet trees will pollinate each other, but two Idared trees will not. Some varieties, called triploids, have sterile pollen and cannot pollinate other trees. A third variety is then required to ensure pollination of all trees.