Dragon fruit (Hylocereus undatus (Haw.) Britton and Rose) is a climbing vine cactus species which has received worldwide recognition, first, as an ornamental plant and then as, a fruit crop (Plate 4.1). Its fruit is the most beautiful in the family Cactaceae with a bright red skin studded with green scales and white or red flesh with tiny black seeds. The flower is so beautiful that it is nicknamed as “Noble Woman” or “Queen of the Night”. The juicy flesh of the fruit is delicious in taste. It is well established as a new crop in Australia, China, Israel, Malaysia, Nicaragua, Taiwan and Vietnam. In Vietnam, it has become a major export, which fetches a higher price than even Durian, the “King of Fruits” ¡n southeast Asia.