These are all plants that form longer stems and most of them can successfully be propagating by cutting them in half. Stem plants are often fast-growing aquatic plants for the background or middle ground of an aquarium or aquascape. Due to the variety of species and sub species you will have a vast selection of many different leaf shapes and colours for the aquarium design. A lot of varieties need good lighting and special substrate and not gravel. The addition of CO2 sometimes bring out magnificent reds in some variety’s