Ceratophyllum demersum, commonly known as hornwort, rigid hornwort, coontail, or coon's tail, is a species of Ceratophyllum. It is a submerged, free-floating aquatic plant, with a cosmopolitan distribution, native to all continents except Antarctica. It is a harmful introduced weed in New Zealand. It is also a popular aquarium plant. Hornwort is one of the easiest freshwater plants to grow. This is demonstrated by its success in the wild where it has spread to every continent except Antarctica, after originating in North America. Its high tolerance to various water conditions makes it ideal for beginners, while its fast growth rate and ease of propagation mean a little will go a long way. It can be used as either a floating plant or rooted in the substrate, giving you more freedom when designing the look of your aquarium. This also increases the range of freshwater fish that can benefit from it.


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 Scientific Name 
 Common Name Height  Width
 Ceratophyllum demersum Hornwort, coontail Trim to suitable length Trim to suitable width
Water Temperature
 Water pH Grow rate Difficulty
 20-28oC 6.0-7.5  Fast  Easy
 Light Requirement   Placement Substrate
 High intensity   mid- to background Fine