Actually some of their tubes are aquatic plants, and most of them have a small circle near the bottom of the label that will say fully submersible or not. I broke down and bought the Amazon Swords in the tubes and I am beginning to see new growth. In the tubes, I have seen: wisteria, amazon swords, anubias, and java ferns, all in various sized tubes. And I have seen downoi (??? helferi i think it is), dwarf hair grass, and a couple others in the envelope looking packages as well.