Hornwort (Ceratophyllum Demersum)
Hornwort (Ceratophyllum Demersum) Is an amazing pond plant, as it helps to add oxygen to the water while also emitting a hormone to help eliminate algae. Hornwort grows well in full sun to full shade and grows in long, branching stems. Hornwort grows quickly and helps to clarify the water as you see in the photos, it is very easy to grow and can be tucked into the substrate at the bottom of the pond, weighted with small anchors or potted in containers with heavy loam, sand, or 1/8th inch aquarium gravel (no larger).
Hornwort is also great for spawning or cover for small fish.This underwater oxygenating grass is the best plant to compete with algae and keep a healthy, clean pond. Other benefits include being a sanctuary for fish from predators and fish fry when young.
When you buy Ceratophyllum Demersum take the rubber band off when planting. The bands can eventually damage the stem and send the plant floating to the surface. Oxygenating pond plants release oxygen in the daylight but also take in oxygen at night so be sure the pond if containing fish has adequate circulation by mechanical means if you have a high fish load. Oxygen levels are lowest in a pond around daybreak. Hornowort / Fanwort is by far the most important plant for a balanced ecosystem without algae.
Plant hornwort in the substrate on the bottom of your pond or plant in small containers using 1/8 inch pea gravel or sand. Hornwort may also be anchored with small weights.