Water depth: any
Site: sun or shade
Horn wort (Ceratophyllum demersum) is a useful oxygenator for deep, cold and/or slightly shaded water, and makes excellent cover for fish breeding. It has branchedand whorls of slightly brittle, bristly, dark green foliage.
Hornwort rarely rakesand so is easily kept under control. In summer, it floats to the surface, the towards the terminal buds becoming thicker and breaking off. These then sink to the bottom, as winter buds, and produce new stems in spring.
Attach a small stone or other weight to the, then lower into .
Propagation: Takeor divide clumps in summer.
Pests and diseases: Trouble free.