Hornwort (Ceratophyllum Demersum)

Hornwort (Ceratophyllum Demersum)
Plant Type:
Stem; free-floating submerged plant
Individual stem width: 3-5cm (1-2in)
Carbon Dioxide (CO2):
5 to 40 mg/l
4 to 30 °C / 10 to 30 °C (optimal)

Ceratophyllum demersum, also called hornwort or coontail, is a sophisticated, ubiquitous, obligate aquatic plant.

In its natural habitat, it is commonly found floating in stagnant and gradual moving water, or anchored within the ground. It is usually referred to both as Coontail due to its tight whirls that resemble a racoon's tail, or as Hornwort. The Latin and commonplace names of hornwort come from the Greek keras meaning horn, phyllon which means leaf, and wort (the Anglo-Saxon phrase for plant).

This species has been utilized in aquaristics since the beginnings of the hobby and has been inside the aquarium trade for decades and is commonly available. It is also widely available as a plant for ponds.

Ceratophyllum demersum is likewise very common inside thewater garden industry, where it's used as an oxygenating plant for small water features and ponds. Hornwort is work well with simply being floated in open water and may be broken into portions to establish new flora. Ceratophyllum demersum is native the United states and makes an excellent habitat for fish to lay eggs on or cover in.

Common names:

  • Rigid hornwort
  • Hornwort
  • Coontail
  • Coon's tail