Not dissin ya canndo,but waaaay to involved of a process for me...but I get the idea...very interesting...
All you have to do to propagate a cactus like these is to take a "pup" or a "sprite" and put it in the ground. You can also take a growing tip, cut it off, let the cut part scab over and put THAT in the ground - takes far less time than working from seeds. If you do it with san pedro you will find that it won't take but a few years before you will have all the cactus you could ever want. they say that they grow as much as a foot a year - I have been finding that to be way off, my plants are growing as much as double that.
So, figure you have one plant well rooted and 6 inches high. You cut 3 inches of it off and put that in the ground. In a few months you will get between one and 7 "sprites" or little offshoots from the cut plant, and after the other growing top roots (several months), this one will grow 4 or 5 inches in the time your sprites take to grow.
Now you have as many as 7 sprites ready to plant and one more growing tip.
Take the 7 sprites and the one tip and plant them, next year you will have 7 more sprites from your original plant, 7 more from your second cut plant and another growing tip - time to cut that one and replant it. Next year you have 14 plants all growing a foot a year and another 21 new sprites to plant - oh, and another growing tip. From that point on you have at least 21 feet of cactus per year, figure three feet per dose that is 7 doses a year but that is only if you eat everything. If you save the growing tips from each one you will double your crop every year even if you eat them all.
Anyone with the forethought to start this in their 20's could have all the psychoactives they need by 25 and have a thriving little business by 30.
