then they don't get root bound then ?I used to have a 6 foot tall san pedro in a 3 gallon pot, it was in there for probably 5 years, and grew each year. not sure what ever happened to that plant...
sorry i didn't get a reply for this.I had to tie lean it against a wall in a corner to make it stand upright. It would flower every year, and put off new growth, but I suspect it would have grown faster in a larger container. the soil also dried out really fast to the point that the cactus would sort of shrivel sometimes if I forgot to water it.