Spiny hornwort Plant Care

Spiny hornwort (Ceratophyllum muricatum) belongs to the Ceratophyllaceae family within the Ceratophyllum genus. Spiny hornwort is native to much of Europe, Asia, Africa, and the Americas. Spiny hornwort is also known as Ceratophyllum cornutum.

Spiny hornwort displays a submerged aquatic plant growth habit, reaching up to 6 ft tall with a spread of approximately 3 ft. Spiny hornwort produces inconspicuous flowers, rarely produced.

Leaf size: approximately 2 inches.

Ceratophyllum muricatum requires watering every 7–14 days. Allow the top layer of soil to dry between waterings to prevent root rot. Reduce watering frequency during winter when growth slows.

Spiny hornwort thrives in full sun to partial shade.

Ceratophyllum muricatum grows best at temperatures of 60–80°F. Spiny hornwort prefers humidity levels of 70–80%. A pebble tray or humidifier helps maintain adequate moisture around the plant.

Nutrient-rich, loamy soil with good drainage. Good drainage is essential for Spiny hornwort to prevent waterlogging, which leads to root rot and fungal issues.

Feed Spiny hornwort every month during the growing season (spring and summer) with a balanced fertilizer diluted to the strength on the label.

Pause feeding in autumn and winter, when growth slows, and never fertilize dry soil — water first.

The PlantoScan app can remind you when to water and when to fertilize each plant.

Does not require traditional potting, grows submerged in water. Choose a pot one size larger than the current container, and ensure it has drainage holes to allow excess water to escape.

Spiny hornwort can be propagated through vegetative propagation through stem cuttings.

See all plants toxic to cats and plants toxic to dogs.

Spiny hornwort is susceptible to generally pest-free. Inspect the foliage regularly, especially along leaf undersides and stems. Treat infestations promptly with insecticidal soap or neem oil to prevent spread.

Yellow leaves, brown tips or drooping? See common plant problems and how to fix them.

Spiny hornwort grows outdoors in USDA Zone 8a – 11b. It survives winters down to planting zone 8a. Spiny hornwort is native to much of Europe, Asia, Africa, and the Americas.