Some autoflower and some don't, either way I'm pretty sure that they don;t get too tall so you probably would be perfectly fine with a mid sized pot. I think HARDDON found some pics of a guy who had a full grow in 2 liter bottles and I'm sure that MDanzig's cross would do just fine. The original LowRyder wasn't supposed to get over 12" from seed to harvest. Although there were some rare cases that they got higher, it's not likely. I'm sure that the MasterLows won't get to be too tall. Of course bigger pots would be better I'm just saying that they aren't absolutely necessery. Goodluck my friend and KEEP US POSTED. I want to see how those turn out.