Hornwort Ceratophyllum demersum

Hornwort
Ceratophyllum demersum

The stems on this perennial are slender and often rootless, growing to 30- 60cm (1-2ft) long. They support whorls of dark green forked leaves 1-4cm in length, which can be quite brittle, they become denser close to the growing point..
This plant is shade tolerant and will therefore grow in deeper water than most submerged aquatic plants. It will also tolerate a wide range of water conditions and makes an excellent oxygenator for the pond and a refuge for fish fry.

Spread indefinite
Water depth to 60cm (2ft)
Hardy
Sun or shade
Propagation by stem cuttings in spring or early summer