Soft Hornwort
Ceratophyllum submersum · Ceratophyllaceae
The gardener's calendar
Ideal time to plant soft hornwort: set it out when the soil is neither frozen nor waterlogged, and water generously as it establishes.
ID card
- Plant type
- Floating or submerged aquatic plant
- Foliage
- Persistent, finely cut and feathery
- Adult size
- Up to 30-50 cm tall, indeterminate growth
- Flowering
- Discreet, tiny white flowers in summer
- Growth
- Fast to very fast
- Hardiness
- Moderate to good depending on climate, temperate to warm zones
- Origin
- Europe, Asia and Africa
- Natural habitat
- Calm waters, ponds, lakes and slow-flowing watercourses
Care
Aquatic environment
Coontail thrives completely submerged or floating in fresh water. Maintain a minimum depth of 15-30 cm depending on the variety. Slow water circulation is beneficial; avoid stagnant water for too long to limit the accumulation of organic matter.
Light
Prefer a position in partial shade or indirect light in an aquarium or pond. Too much shade slows growth; too much direct light can promote competing algae development. Ideally 6-8 hours of light per day.
Fertilization
In a natural pond, fertilization is generally unnecessary. In an aquarium, occasionally add specialized liquid fertilizers for aquatic plants if growth slows. Follow recommended doses to avoid water eutrophication.
Substrate and anchoring
Coontail does not require soil; it absorbs nutrients directly through its leaves and fine floating roots. A silty or sandy substrate at the bottom of the pond can serve as an optional anchor point, but the plant develops well freely floating too.
Pests and problems
Generally hardy and rarely susceptible to disease in a pond. In an aquarium, watch for algae that can smother it and snails that consume young leaves. A healthy biological balance prevents most problems. Regularly remove dead leaves.
Did you know?
Coontail is an excellent natural oxygenator for garden ponds: it produces oxygen during the day and absorbs nitrates from the water, which helps maintain ecological balance and control algae. Its finely cut leaves have made it a plant appreciated for a long time by aquarium enthusiasts and fish farmers.
Where to buy it
Best planted in spring or autumn, away from frost and heatwaves. Pick a plant with healthy foliage and roots that are not exposed. Best time: March, April, May, September, October.
Add this plant to my garden →Plants from the same family
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- SageSalvia officinalis
Tips generated and checked by Viridia — adapt them to your local climate.