Hornwort (Ceratophyllum demersum)
Care, watering, light and tips for Hornwort on Floravia.
Quick facts
- Family: Ceratophyllaceae
- Difficulty: Easy to care for
- Watering: every 7 days
- Light: Partial shade
- Temperature: 10–30 °C
About Hornwort
Ceratophyllum demersum, commonly known as hornwort, is a fast-growing, rootless aquatic plant that can float or be anchored. Its densely branched stems are covered with fine, delicate leaves, giving it a feathery and lush appearance. It is ideal for freshwater aquariums, ponds, and paludariums, where it helps oxygenate the water and provides shelter for aquatic life.
Native range
Cosmopolitan, found in nearly all temperate and tropical regions worldwide.
Care tips
Hornwort thrives in moderate to high light; insufficient lighting can lead to leggy growth. It does not require substrate as it absorbs nutrients directly from the water, making it excellent for beginners. Avoid sudden changes in water parameters, as it is sensitive and may shed leaves, though it recovers easily. It does not need additional fertilization in established aquariums, as it feeds on organic waste.
How to save a dying Hornwort
- Warning signs
- Soft stems, leaf shedding, brown or whitish discoloration. Unusual floating.
- First aid
- Remove organic debris, clean water. Ensure good light and stable temperature (18-28°C).
- What kills it
- Turbid water, lack of light, sudden temperature changes, excessive competing algae.
- Can it be saved?
- Yes, it's very hardy. Cut healthy parts and replant. Improve aquatic environment.