I can find no reference whatsoever regarding the three types of cacti. I don't know that anyone (other than these people) is cultivating it. In Mexico, they grow and harvest agape (but that's not a cactus) for tequila. I can't find any information on it so I guess I will take their word on this.
When you know a thing, to hold that you know it; and when you do not know a thing, to allow that you do not know it - this is knowledge.
Confucius, The Confucian Analects