A pitaya or pitahaya is the fruit of several cactus species indigenous to the Americas. "Pitaya" usually refers to fruit of the genus Stenocereus, while "pitahaya" or "dragon fruit" refers to fruit of the genus Hylocereus.
Learn how to grow dragon fruit, it’s one of the most strange looking subtropical fruit you’d like to grow in your garden. Growing dragon fruit is fairly easy both outdoors or in the pot. - My Gardening Today