Plant care
Cobra Lilytemperature & humidity
Darlingtonia californica
More about cobra lily
Ideal temperature for cobra lily
Aim for Cool roots below 21C; air to ~27C, hardy to about -9C dormant (Cool roots below 70F (ideal 40-55F); air to ~80F, hardy to about 15F when dormant) 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
Cobra Lily is comparatively hardy (USDA 7a-10b (outdoors); needs a cold winter dormancy, RHS undefined). 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 cobra lily
Cobra Lily sits happiest at around Moderate to high (50%+) relative humidity. Bog-origin plant that likes humid air, but humidity is secondary to root temperature — if the roots stay cool and the soil stays wet, average household humidity is usually fine. Good airflow helps prevent fungal issues on dormant or damaged pitchers. 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.
Cobra Lily temperature & humidity — frequently asked questions
What temperature is best for cobra lily?
Cobra Lily grows best between Cool roots below 21C; air to ~27C, hardy to about -9C dormant (Cool roots below 70F (ideal 40-55F); air to ~80F, hardy to about 15F when dormant). 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 cobra lily tolerate?
Cobra Lily starts to suffer below roughly 21°C. It tolerates a cold dormant period within USDA 7a-10b (outdoors); needs a cold winter dormancy, but a wet cold root zone is more dangerous than cold air.
What humidity does cobra lily need?
Cobra Lily prefers about Moderate to high (50%+) relative humidity. Bog-origin plant that likes humid air, but humidity is secondary to root temperature — if the roots stay cool and the soil stays wet, average household humidity is usually fine. Good airflow helps prevent fungal issues on dormant or damaged pitchers.
How do I raise humidity for cobra lily?
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 cobra lily live outside?
Cobra Lily is rated for USDA zone 7a-10b (outdoors); needs a cold winter dormancy. 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 cobra lily care
In the UK? Keeping cobra lily warm in a UK home covers the radiator, single-glazing and heating-season humidity angle. Temperature and humidity are one piece. See the full cobra lily care guide, its cold-hardiness guide, and watering schedule — humidity and watering problems are easy to confuse.