That will work with many cactus but not saguaro. They must be started from seed and the large ones can be well over 100 years old. (source: I moved and planted

That will work with many cactus but not saguaro. They must be started from seed and the large ones can be well over 100 years old. (source: I moved and planted saguaro professionally for like 5 years). Another note (in case anyone is interested). I experimented a lot with germinating saguaro seed back in those days and found a method that produces high germination rates. I fermented the seed within the crushed fruit with a little sugar and water for a week or so. Then dried the pulp and extracted the seed. Then put the seeds in a water bottle with a handful of sand. Then put water in the bottle and shook it vigorously for 10 minutes or so. Then poured it out and dried it. I planted the dried sand/seed together because it was hard to separate out the tiny seeds. Plant very shallow. Mist several times a day and keep the tiny seedlings well shaded with filtered light. Small saguaro need a "nurse plant" i.e. they will start under a bush with filtered light, and by the time they are big enough to poke through they can handle full sun (4 or 5 years). I think this method somewhat duplicates passing through an animals digestive tract, then the action of being tumbled over rock and sand during torrential seasonal rain.