Plant care
Drosera Filiformistemperature & humidity
Drosera filiformis
More about drosera filiformis
Ideal temperature for drosera filiformis
Aim for 21-32°C summer; 0-10°C winter dormancy (70-90°F summer; 32-50°F winter dormancy) on the thermostat and you've handled the easy part. The hard part is the half-metre around the plant: window glass that drops to near-freezing on a January night, a radiator pumping out hot dry air, a draught from an opened front door. Move the plant 30 cm and you've usually fixed the problem. Below roughly 21°C growth pauses; cold beyond that pushes it into dormancy rather than killing it outright.
Cold tolerance & winter care
Drosera Filiformis is comparatively hardy (USDA 6-9 (the northern form is hardier; needs cold dormancy), 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 drosera filiformis
Drosera Filiformis sits happiest at around 40-60% relative humidity. Average to slightly elevated humidity is fine outdoors and indoors; constant root wetness matters far more than air moisture. Very dry indoor air can reduce dew, so good light plus a wet tray usually suffices. 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.
Drosera Filiformis temperature & humidity — frequently asked questions
What temperature is best for drosera filiformis?
Drosera Filiformis grows best between 21-32°C summer; 0-10°C winter dormancy (70-90°F summer; 32-50°F winter dormancy). 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 drosera filiformis tolerate?
Drosera Filiformis starts to suffer below roughly 21°C. It tolerates a cold dormant period within USDA 6-9 (the northern form is hardier; needs cold dormancy), but a wet cold root zone is more dangerous than cold air.
What humidity does drosera filiformis need?
Drosera Filiformis prefers about 40-60% relative humidity. Average to slightly elevated humidity is fine outdoors and indoors; constant root wetness matters far more than air moisture. Very dry indoor air can reduce dew, so good light plus a wet tray usually suffices.
How do I raise humidity for drosera filiformis?
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 drosera filiformis live outside?
Drosera Filiformis is rated for USDA zone 6-9 (the northern form is hardier; needs cold dormancy) 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 drosera filiformis care
In the UK? Keeping drosera filiformis warm in a UK home covers the radiator, single-glazing and heating-season humidity angle. Temperature and humidity are one piece. See the full drosera filiformis care guide, its cold-hardiness guide, and watering schedule — humidity and watering problems are easy to confuse.