BUYER BEWARE! This plant is not a good fully submerged candidate. It prefers to grow emersed and most of the time I have found it will only survive a few years submerged before the plant will start dieing and producing long stems which reach out of the water and sprout many babies. Usually, unless vigorously pruned 24/7 this plant will keep on trying to grow out of the tank, it is very obstinate, it just wont stop. I ended up killing mine trying to get it to stay compact.