Say i have a 4ft Trichocereus bridgesii (achuma) potted and growing, Can i just chop off a foot or 2 and she'll be fine, she will continue to grow???
oh yea, thats actually good to cut the top. a lot of people dont know that. if u cut the top, many others will grow from the sides u should probably cover the top with foil for a couple of weeks to prevent any roting my dad used to do that to our papaya tree, and like indian people came to our door and asking how he did that lol cuse it usually just grows tall... but yea, do that. and i suggest a foot, or lees. or even more depends on how tall is the cacti alot of people do that to the cacti when its small, and buy the time ull have a foot tall cacti, the guy who cuts it will have like 5. and u can continue cutting the tops, and the base (main stem) wit get fatter and fatter. if u have any other questions, make sure u ask