Plant care
Soft Hornworttemperature & humidity
Ceratophyllum submersum
More about soft hornwort
Ideal temperature for soft hornwort
Temperature kills fewer soft hornwort plants than you'd think. What kills them is the micro-climate within a normal-temperature room — a leaf pressed against single-glazed winter glass, the hot dry updraft directly above a radiator, the cold blast from an AC vent. The thermostat reading at 15-30°C (59-86°F) is fine; the spot you put the plant in matters more. Below roughly 15°C growth pauses; cold beyond that pushes it into dormancy rather than killing it outright.
Cold tolerance & winter care
Soft Hornwort is comparatively hardy (USDA 5-11 (in the wild; aquatic; adaptable to many climates outdoors), RHS H4). Within that range it tolerates a cold dormant spell outdoors; outside it, grow it in a container you can move under cover or overwinter in a cool but frost-free spot. Hardiness assumes an established plant in well-drained soil — a wet, cold root zone kills far more plants than cold air alone.
Humidity for soft hornwort
Soft Hornwort sits happiest at around 100% (fully aquatic) relative humidity. Exclusively submersed aquatic. Not suitable for emersed or paludarium cultivation. The usual low-humidity tell is crisp brown leaf tips and edges while the soil moisture is fine — a sign the air, not the watering, is the problem. If you need to raise it, the reliable methods are grouping plants together, standing the pot on a tray of damp pebbles (the pot above the waterline, never in it), or running a small humidifier in winter when indoor heating dries the air most. Misting is the least effective — it raises humidity for minutes, not hours.
Soft Hornwort temperature & humidity — frequently asked questions
What temperature is best for soft hornwort?
Soft Hornwort grows best between 15-30°C (59-86°F). Keep it out of cold draughts, off freezing windowsills in winter, and away from the hot dry air directly above radiators — the extremes matter far more than the average room temperature.
How cold can soft hornwort tolerate?
Soft Hornwort starts to suffer below roughly 15°C. It tolerates a cold dormant period within USDA 5-11 (in the wild; aquatic; adaptable to many climates outdoors), but a wet cold root zone is more dangerous than cold air.
What humidity does soft hornwort need?
Soft Hornwort prefers about 100% (fully aquatic) relative humidity. Exclusively submersed aquatic. Not suitable for emersed or paludarium cultivation.
How do I raise humidity for soft hornwort?
Group it with other plants, stand the pot on a tray of damp pebbles (kept above the waterline), or run a small humidifier in winter. Misting only helps for a few minutes, so it is the weakest option for a plant that genuinely needs more humidity.
Can soft hornwort live outside?
Soft Hornwort is rated for USDA zone 5-11 (in the wild; aquatic; adaptable to many climates outdoors) and RHS hardiness H4. Within that range it can stay outdoors; outside it, grow it in a moveable container and protect the roots from a wet, cold winter.
More soft hornwort care
In the UK? Keeping soft hornwort warm in a UK home covers the radiator, single-glazing and heating-season humidity angle. Temperature and humidity are one piece. See the full soft hornwort care guide, its cold-hardiness guide, and watering schedule — humidity and watering problems are easy to confuse.