Also the plant wont flower until the daylight shortens so if you want to start flowering earlier than august or october just (when they are good size) the more mature the more better yeild you should expect I would wait until at least 2 feet. Just bring the plants into a completly dark area (like a closet or some where compleatly dark) and go 12 hrs day and 12 hours night for vegatation I would give them at least 14 hours of light.