Hornwort
Ceratophyllum demersum
Edited by Ivan F. · Reviewed
Beginner verdict
A fast-growing, bushy plant that you can float or weigh down, and it soaks up nutrients quickly. It gives fry and shy fish lots of cover, and its growth can help hold algae back. It sheds needles when stressed, so be ready to do a little extra tidying.
- Light
- Low
- CO2
- Not Needed
- Growth
- Fast
- Placement
- Floating
- Max height
- 12 in (30 cm)
- Temperature
- 50–86 °F (10–30 °C)
- pH
- 6–9
- Needs substrate
- No
Hornwort care
How it spreads
Simply break off a piece and it will grow into a new plant.
Hornwort care mistakes to avoid
- Expect shedding, especially after a move. Vacuum up the fallen needles.
- Trim it often, because it can quickly shade out everything below it.
- Do not rely on it in very warm tanks, as it prefers cooler water.
- Keep it out of filter intakes, which needles can clog.
Hornwort setup
LightLow light
Our sources rate Hornwort as a low light plant. These are the lights we chose for a first planted tank.
hygger 18W LED Aquarium Light (18-24 inch) US
NICREW ClassicLED Plus Aquarium Light US
EHEIM classicLED plants 550 mm Spain
EHEIM classicLED daylight 550 mm Spain
Why we chose these (Best Light for a Beginner Planted Tank). Nobody here has used or tested them.
SubstrateNeeds no substrate; it floats or can be anchored in the bottom.
We are still choosing products for this.
Where to buy Hornwort
We have not found a store that sells Hornwort under its scientific name yet. We add stores as we confirm them.
Live animals and plants travel by courier. Check the store's live-arrival guarantee, and only buy once your tank has cycled (see how to cycle a fish tank).
Some US states restrict certain species. Check our US state aquarium rules table and your state's own rules before you buy.
Hornwort FAQ
How tall does Hornwort grow?
Tropica lists growth to about 30 cm (12 in) in a tank, and it can grow larger over time.
What light does Hornwort need?
Tropica rates its light demand as low. Most standard aquarium lights are enough.
Should I plant hornwort or float it?
Either works. It has no true roots, so floating is easiest. Weigh it down if you would rather have it standing in the tank.
Why is hornwort shedding so much?
It often sheds when adapting to new water. Growth usually settles once it has adjusted, so scoop up needles until then.
Hornwort facts and sources
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