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Ceratophyllum demersum has whirled leaves which
are densely crowded at the apex of beautifully branched stems, whereas
internodes may exceed 3 cm in length at the base of older stems. Ceratophyllum
demersum is an obligate submerged perennial plant which does not form
roots. In Nature it is usually found buried in sandy to silty sediments where
it anchors itself by modified leaves. Ceratophyllum demersum often
forms monospecific populations and is found down to 10 m depth as individual
very slow-growing plants. In the aquarium, on the other hand, it prefers
relatively high 10510j918k light, and it does not tolerate transportation for extended
periods. It excretes substances toxic to algae (allelopathic behaviour) and
at good growth conditions it efficiently inhibits most algae growth.
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