Autos are supposed to be planted in their final pot...no transplanting..from most everything I have read. However before I knew this I grew a couple of autos started in a 18 oz solo cup then to about 1/2 gal pot and finally to their final 2 1/2 gal pots and they grew fine. Maybe the yield would have been higher by not transplanting, I don't know. I started a couple of new autos this week and started them in their final pot so we shall see how much better this works.