It seems that the roots don't develop into full root structures. They just shoot straight down to the bottom and end up root bound early. Anyone have advice on getting the roots to travel around the empty parts of the soil. Maybe I'm not watering enough, soil to aerated, not aerated enough? .
Im going to guess you plant in large containers... roots on this plant grow horizontally for the most part....so as they touch the sides of the pot, they grow down to aviod the obstruction, which ofcourse is still there, now they massup on the bottom. try using wider & shallower pots and more importantly use small pots and work your way up to larger pots. soon as you suspect they are masssing on the bottom of the pot again, transplant, trying to go into the final pots 2 weeks before going into flower. hope this helps