All you have to do to start flowering it change the lights from 18/6 to 12/12. I only have a few grows under my belt, but I trim alot. I find that its helping to shape my plants, keep them short, and increase the number of bud sites on them. Many people don't agree with this, I'm not saying I'm right, or that it isn't some what detrimental to them, it does stress them. But they are turning out exactly like I want them to. They are almost 2 months old, and I'm gonna be flowering them this coming weekend. They are turning into some nice ass bushs though. Check my thread I think theres pics one page back from the end.