Yep, San Pedro in particularly root really well from cuttings. (I won't ask "why" you were rooting trichocerus lol). But Saguaro are quite different. They have

Yep, San Pedro in particularly root really well from cuttings. (I won't ask "why" you were rooting trichocerus lol). But Saguaro are quite different. They have an internal woody skeleton. I think they are the only member of their genus. At any rate I failed completely to root them and all cuttings died. I've also seen them fallen over but not dead in the wild many times and they didn't root at the point they touched the soil. It's a completely understandable assumption that they would root from cuttings though as many other cactus do.