Hygrophila polysperma 'Rosanervig'Hygrophila polysperma 'Rosanervig' is normally an undemanding plant. It may suddenly develop shoots that are entirely green. Remove these to keep the distinctive pink, marbled leaves. If you want deep pink leaves, you must provide intensive light. Stems becomes 20 40 cm tall and 5 8 cm wide. The distinctive colouring of the pale leaf ribs is probably caused by a virus which prevents chlorophyll from being produced in the cells around the leaf ribs,