Hornwort (Ceratophyllum demersum) is one of the easiest and fastest-growing freshwater aquarium plants available. Known for its dense, feathery green foliage, Hornwort is an excellent choice for beginner aquariums, shrimp tanks, breeding tanks, low-tech planted aquariums, and anyone looking for a hardy plant that can quickly add greenery and cover to their tank.
One of the biggest advantages of Hornwort as an aquarium plant is its versatility. Unlike most aquatic plants, Hornwort does not develop true roots and does not require aquarium soil or a nutrient-rich substrate. It can simply be left floating in the aquarium or gently anchored in place to create the appearance of a traditional background plant.
Hornwort is also a popular choice for shrimp tanks and fish breeding aquariums. Its dense, branching foliage creates an intricate network of hiding spaces where shrimp, baby shrimp, fish fry, and other small aquarium inhabitants can find shelter.
Difficulty: Easy / Beginner Friendly
Placement: Floating or background.
Lighting: Low to moderate lighting is generally sufficient, while stronger lighting can encourage faster and denser growth.
CO₂: Not required.
Substrate: Not required. Hornwort is a rootless aquatic plant that obtains nutrients directly from the water column.
Fertilization: Can benefit from liquid aquarium fertilizer when nutrients in the water column are limited.
Maintenance: Trim regularly as needed to control its fast growth and prevent excessive shading of other aquarium plants.
| Specification | Details |
|---|---|
| Common Name | Hornwort / Coontail |
| Scientific Name | Ceratophyllum demersum |
| Family | Ceratophyllaceae |
| Plant Type | Rootless Aquatic Plant |
| Growth Rate | Fast |
| Placement | Floating / Background |
| Lighting | Low to Moderate |
| CO₂ | Not Required |
| Substrate Required? | No |
| Nutrient Uptake | Water Column |
| Propagation | Stem Cuttings |
| Difficulty | Easy |
Yes. Hornwort can be grown completely free-floating and does not need to be planted in aquarium substrate. Floating Hornwort is one of the easiest ways to grow the plant and allows it to receive plenty of light while absorbing nutrients directly from the water column.
Floating Hornwort can create a dense mass of vegetation near the surface, providing shade and shelter for fish and shrimp below. Because the plant grows quickly, simply trim or remove excess growth whenever it becomes too dense.
Hornwort can also be positioned vertically to create the appearance of a traditional background aquarium plant. However, Hornwort does not develop true roots, so it does not need to be buried like a rooted stem plant.
If you prefer an upright appearance, gently anchor the lower stems using a plant weight, rock, or other aquarium-safe method. Avoid deeply burying or crushing the lower stems.
No, Hornwort does not require supplemental CO₂ injection. Its adaptability and rapid natural growth make it an excellent aquarium plant for low-tech setups where pressurized CO₂ is not being used.
Supplemental CO₂ may influence growth in planted aquariums, but it is certainly not necessary to successfully grow healthy Hornwort.
Hornwort is an excellent plant for freshwater shrimp tanks and fish breeding aquariums. Its dense, finely divided foliage creates countless small spaces where shrimp, baby shrimp and newly hatched fish can shelter.
The large amount of plant surface area also provides additional habitat within the aquarium for microorganisms and biofilm, which can be particularly useful in established shrimp and fry tanks.
Hornwort is considered a fast-growing aquarium plant. Growth rate will depend on lighting, nutrients, temperature and other aquarium conditions, but healthy Hornwort can quickly produce substantial new growth.
This makes Hornwort useful when you want to quickly increase the amount of plant material in an aquarium. Because of its vigorous growth, occasional trimming and thinning are usually necessary.
Propagating Hornwort is extremely simple. Cut a healthy section of stem and allow the cutting to float or anchor it in another area of the aquarium. The cutting will continue growing and develop into another section of Hornwort.
This easy propagation method makes it possible to turn a relatively small amount of Hornwort into a substantial mass of plants over time.
Looking to buy Hornwort in Canada? Aquascaperoom supplies healthy Hornwort (Ceratophyllum demersum) for freshwater aquariums, shrimp tanks, breeding setups and planted tanks.
Our live aquarium plants are carefully prepared and packed for shipment from Ontario to customers across Canada. Whether you're building your first planted aquarium or simply looking for a fast-growing, easy aquarium plant, Hornwort is one of the most versatile choices available.
Shop Hornwort in Canada from Aquascaperoom — Canadian freshwater aquarium plants and professional aquascaping supplies.