For whatever its worth, the dimensions of my grow box are 29.5" x 14" x 18.5" of usuable space. My "big" plant is about 21" and my clone is about 7.5". My best guess I started flowering my plants when they were between 8 and 10 inches and the clone at 3". I believe I harvested my first plant a week early. Its still a great "up" high though. The development of my remaining plants has surpassed the first plant by far, the calyx development is astounding to say the least. The swelling it has shown since the pics i took on friday is much more pronounced today, just hope they're not seeds, hehehe. I'll be posting pics on friday.