How to prune ceratophyllum demersum

As needed, any time of year. Pinch or cut stem tips with scissors to your desired length. Remove the trimmed portions from the tank promptly as detached fragments will continue to grow and spread. Thin the plant if it is blocking light to lower plants.

Weekly to bi-weekly in good conditions. Hornwort (Ceratophyllum demersum) grows very fast and needs regular trimming to prevent it from taking over the aquarium. Pinch or cut back stem tips frequently to keep growth in check and encourage bushier, denser growth. It sheds needles readily, so trim carefully to minimize debris. No rooting — it floats or is loosely anchored.

Pinch or cut stem tips with scissors to your desired length. Remove the trimmed portions from the tank promptly as detached fragments will continue to grow and spread. Thin the plant if it is blocking light to lower plants.