well i used UB's top for 2-4 main colas to double yield. i definitely have the space though haha. well with training id say they could get 6-8 ft. i would fim them though. prob twice to get 16 tops to make big bushes haha. but that requires a long veg. and you are running outa time. so you could top if you want the thread on how to top them, which btw i do recommend on doing. you can see pics of UB's outdoor plant he topped. huge colas. prob 5 ounces or more a cola.