Growing cacti from seed is easy and rewarding! It takes patience and a few guidelines to start cactus seeds.
This is a macro video demonstrating how to remove the fruit and harvest the seeds from a cactus (Species is Mammillaria Haageana). This variety does bear edible fruit known as Chilitos, and I did taste it afterwards! A bit underripe, sour, no distinct flavors just yet..but not unpleasant!