Hydrophila polysperma ‘Sunset’, or ‘Rosanervig’ (red-vein) as it was named by the Danish aquatic plant nursery Tropica, was originally cultivated in the mid 1980’s. One note of interest about this plant is the white coloration the leaf veins often exhibit. This is not a sign of a deficiency but rather it is believed to be caused by a virus that blocks the production of chlorophyll in the surrounding tissue. This virus, fortunately, is specific to this particular species and poses absolutely no threat to anything else in the aquarium. This beautiful variation of the steadfast H. polysperma, a native of Asia, has become a common but popular addition to the planted aquarium hobby.
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