I think there is a trick to growing GIANT Trees, but I do not know it. I know from experience, you do not want to grow SATIVA indoors, they get way way too tall. And Indica does not get but 3 to 4 1/2 feet tall, even if they are giant bushes. I have quit the SOG and I always try to grow giant bushes-trees. I 've had one plant yield 7 ounces and it had 12 or 13 main stalks or trunks or limbs, full of buds and giant tops. (see my pic at my signature and my pics in my album) I average 3 ounces of dried manicured buds from one plant now.
What I fianally figured out, after 4 years of in-door growing that works for me, is I start more plants than I really want, and when they are 3 or 4 weeks old, I toss the runts and ones with just a single trunk or center branch or limb. I keep the ones with over 6 vertical branches.