Hornwort (Ceratophyllum demersum)

Where?

The hornwort grows best in nutrient-rich (eutrophic), stagnant to slow-flowing and summer-warm waters, with humus-rich muddy soils in water depths of 0.5 to 10 meters.

Appearance?

Submerged living plant with often reddish stems between 30 and 100cm long. Dark green, once, or twice branched, rigid leaves, arranged radially at regular intervals around the stem.

Special Features?

Rare, inconspicuous flowers up to 3mm long, between July and September. Its dense growth can outcompete native underwater vegetation, leading to loss of biodiversity.