I think there are some methods to "bonsai" the plants. Controlling the rate of the root growth is one. Topping/transplanting seems to be another. Keeping a consistently warm temp through transition as well.
@arty zan hasn't been around much lately but he has a "dwarfing" technique that is along those lines. Doing tiny plants has definitely been fun as a learning process, and to get a variety of meds but now that I have the space to do organic in big pots its *so* much easier. Still stuffing the tent
but less work keeping them happy in the 10 and 20 gal pots lol.