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Ceratophyllum demersum

Ceratophyllum demersum

Scientific name: Ceratophyllum demersum

Family: Ceratophyllaceae

Usual maximum size in aquariums: 10 - 80 cm (3.94 - 31.5 inch)


Recommended pH range for the species: 6.2 - 7.5

Recommended water hardness (dGH): 4 - 18°N (71.43 - 321.43ppm)

0°C 32°F30°C 86°F

Recommended temperature: 21 - 28 °C (69.8 - 82.4°F)

Reproduction of the plant: Cuttings

Origin (in the wild): Everywhere

How fast these plants grow: Fast

Recommended substrate: Sand

Demands on lighting: Bright

Ideal placement in a fish tank: Background

Common Name

Rigid Hornwort


This plant is found all over the world.

Planting Area

Background or floating


This is a very easy plant to propagate, cuttings are taken from anywhere on the plants and these will develop a basic root structure. It is quite often used as a floating plant but cuttings can be placed into the substrate, remove some of the lower leaves to reveal a small portion of bare stem, carefully place this into the substrate without crushing the stem itself.



Short Description

As mentioned above, this plant only has a basic root structure but it will anchor itself if placed into the substrate. As a floating plant it will soak up nitrates in the water and also release a substance that controls excess algal growth.


Ceratophyllum demersum, resized image 1 Ceratophyllum demersum, resized image 2 Ceratophyllum demersum, resized image 3

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