A classical plant in Dutch style tanks. It looks nice in every aquarium as a hedge or dense group. The single plant gets about 10-30 cm tall and 5-10 cm wide.
Lobelia cardinalis, the cardinal flower, is a true American, a native plant originally found in the eastern and central regions of the United States on moist ground alongside rivulets, ponds and road ditches. Its emersed form sports green leaves with a purple underside and attractive scarlet bell-shaped flowers, which make it a very popular and beautiful ornamental plant in its land of origin. The submersed plant is of a light green, though. L. cardinalis has been used for Dutch-style aquaria for a long time, and is quite widely spread in trade.