Hydrophila polysperma "Sunset", in Europe sold under the name "Rosanervig", has its origins in the Danish aquatic plant nursery Tropica. One special characteristic of this variety are the white-coloured leaf veins. They are not the symptom of a nutrient deficiency, though. It is assumed that a virus prevents the tissue around the veins from producing chlorophyll. This virus specialises in this variety only and thus poses no danger at all for the rest of the aquarium plants. This variety of the so well-known robust Asian H. polysperma has become a very highly coveted aquarium plant.

This undemanding red-coloured plant is very interesting as it is probably the easiest plant of that hue in cultivation. It grows under almost any conditions. Temperatures between 18 and 28 °C, pH values in the range of 5 to 8 and a water hardness of soft to hard are tolerated very well, which shows how adaptable this plant is. It does not require lots of light and CO2, however, when provided with these factors its reddish colour gets more intensive. Iron also plays an important role for the reddish hue, too, as the plant colour tends to fade to shades of pale white if there is insufficient iron in the water column.