you may find answers here http://freealoeplant.tripod.com/id2.html
The most frequently asked questions and aloe planting care and instructions.
Their large, colorful blossoms appear in yellow, pink, red or purple and grow from the tip of cactus nodules, which later ripen into delicious red fruit. Many varieties of prickly pear cactus grow wild throughout the deserts of the Southwest, but many are not native. Some species of prickly pear cactus were introduced into North America from tropical America a number of centuries ago.