This tender marsh-plant from the south of the USA wil thrive both submerged and above water in wet soil. It is a very welcome aquarium-plant too of which the green leaves may colour into red in very intense light; with a shortage of fosfate it will go pinkish. If crushed the rather succulent leaves wil spread a lemon aroma. The little plant may produce lilac-blue flowers (even submerged). Rather slow growth. This perennial should be kept frost-free during winter. N.B. Scientists have succeeded with some exx. of this species by inserting golden nano-particles to produce spontaneous light-emitting properties in the leaves.