OK, thanks. I am new to growing sativa. However I have prepared for the height. I think I could fit a six foot plant in my grow room. That would be pushing the limit but I could do it. If it appears it may be getting to tall I could always throw a scrog net up. I have two six hundred watt lights and plan on growing six plants in three gallon containers. I have enough seeds for several grows so I'm saving a super silver haze, neville's haze and a hawaiin snow for after I gain some hands on experience.