When they were about 3 weeks old, I topped them. When growth restarted I tied the main stalk down using that flexible green wire. Every time a shoot got a couple of inches long I would clip it off, wait a couple of days, and tie the shoot down. It ended up that I had tied the plant down in 10-15 spots. I continued to cut off the growing shoots all the way into the 3rd week of flowering, then stopped pruning. I never did however stop tying the plants down whenever I could. The end result was an extremely squat but good plant. I was a little worried that all the stress may cause them to go hermie, as my temps were a little on the high side as well, but everything came out fine.