Ariocarpus is another genus of cacti that is also reported to have psychoactive effects. The problem is that once you get outside of Lophophora and Trichocereus then if mescaline is present it is usually only there in tiny amounts. There are other less well understood compounds that may have effects. But people always seem to fall back on Peyote and San Pedro because they are better understood and the effects are strong and classically psychedelic. Why not bioassay your cactus and report the effects to us? I once attempted to eat the dried outer green flesh of Saguaro but the taste was so intensely bitter, much more so than Trichocereus, that I abandonned the experiment. Trichocereus are so widely available and fast growing that I never seriously explored other types of cacti.

I'm looking forward to your report from January. I cant find any online trip reports for this species, and only one report for the closesly related Saguaro cactus (Have you read it? https://erowid.org/experiences/exp.php?ID=103464). It will be interesting to hear how the Pachycereus pringlei expereince goes, and whether or not the effects are even pleasant.

I'm growing one of these. Looking forward to a January report.

I can add that this cactus survives my local winter (down to 10F), so it seems very hardy.

Saguaro? I dont see any red spines unless the picture was taken straight after the dormant period. How old is it? I'm guessing two years judging by the new growth. I see it's thrown out a new rib, mine still has it's original amount.