Ceratophyllum Demersum (Hornwort)

Ceratophyllum has no roots, but it is still possible to plant it in the bottom of an aquarium and stems can become up to 80 cm tall and 5 cm wide. Many hobbyists float this plant as it makes for a good hiding place for fry.

Natural History

Ceratophyllum demersum grows in lakes, ponds, and quiet streams with summer water temperatures of 15-30°C. In North America, it occurs in the entire US and Canada, except Newfoundland. In Europe, it has been reported as far north as at a latitude of 66 degrees in Norway. Other reported occurrences include China, Siberia (at 66 degrees North), Burkina Faso (Africa), Vietnam, and New Zealand (introduced). Ceratophyllum demersum grows in still or very slow-moving water.

Pro Tips

In aquariums this plant appears to drop all its leaves when exposed to products designed to kill snails. The stems can recover relatively quickly, growing new leaves within a few weeks.

Type: Stem
Origin: Cosmopolitan
Growth Rate: High
Light Demand: Low
CO2: Low