I wouldn't say most anymore, (super autos and all that...) but the "little" ones still have the potential to get up to a good height, even when starting at 5 inches or so. Your not quite flowering yet though, it's just showing sex with its preflowers. It will begin flowering for real soon. If you keep an eye on the tops you'll see how the growth changes from looking like emerging alternating fan leaves to looking like a "cabbage" when it really starts flowering. Shortly after that it will start getting fuzzy with pistils.