the only thing u can do to force flower them that i know of is put a black trash bag over them in the evening or night depending on your sun so u can get the 12/12 , but i dont know many details about doing so, as far as how long u need to do it and when u stop using the bags will they go back to veg state but im sure if u look around or ask around here u will most definatlt find an answer to thoes ?'s, i plan to do so myself here pretty soon, and also, they WILL continue to get taller as they flower, flowering does not stop the growth of the plant, it just changes how it does it, i do believe that it will not grow near as fast tho.