Ceratophyllum demersum is known by many common names, such as rigid hornwort, hornwart (a frequent misspelling), and coontail. It grows very tall in the wild and will easily reach all the way to the top of your aquarium or pond.
Normally hornwort is found floating at the water surface, but when planted in the substrate, it looks like a fluffy underwater bush with many long branches or side stems. The bright green leaves are thin and rigid, similar to pine needles. Much like water sprite and java moss, hornwort has dense foliage that provides excellent protection for baby fish and shrimp.
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