it depends on the training you do to the plant and what kind of strain it is... iv seen people on this forum with, granted they are outdoors not indoors, large 9ft tall 9 ft wide bushes so yes depending on how you are training them they will most defently bush up. if they are bushing too much you may need to do some cleaning up of lower, smaller growth that doesnt get much light due to the bushyness, those little gorwths wont do much more if they cant get light, maybe spread out and tie down all large branches, try to open up the middle a bit so more of the plant gets equal light... just a thought