Plant care
Dragon Arumtemperature & humidity
Dracunculus vulgaris
More about dragon arum
Ideal temperature for dragon arum
Aim for 15-27°C (59-81°F) 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 15°C growth pauses; cold beyond that pushes it into dormancy rather than killing it outright.
Cold tolerance & winter care
Dragon Arum is comparatively hardy (USDA 5-8 (mulch the tuber in colder gardens; reliably hardy in 6-8), 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 dragon arum
Dragon Arum sits happiest at around 40-60% relative humidity. Average outdoor humidity suits it; as a sun-loving Mediterranean geophyte it has no special humidity needs and prefers good airflow, which also disperses its short-lived foul scent. 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.
Dragon Arum temperature & humidity — frequently asked questions
What temperature is best for dragon arum?
Dragon Arum grows best between 15-27°C (59-81°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 dragon arum tolerate?
Dragon Arum starts to suffer below roughly 15°C. It tolerates a cold dormant period within USDA 5-8 (mulch the tuber in colder gardens; reliably hardy in 6-8), but a wet cold root zone is more dangerous than cold air.
What humidity does dragon arum need?
Dragon Arum prefers about 40-60% relative humidity. Average outdoor humidity suits it; as a sun-loving Mediterranean geophyte it has no special humidity needs and prefers good airflow, which also disperses its short-lived foul scent.
How do I raise humidity for dragon arum?
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 dragon arum live outside?
Dragon Arum is rated for USDA zone 5-8 (mulch the tuber in colder gardens; reliably hardy in 6-8) 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 dragon arum care
In the UK? Keeping dragon arum warm in a UK home covers the radiator, single-glazing and heating-season humidity angle. Temperature and humidity are one piece. See the full dragon arum care guide, its cold-hardiness guide, and watering schedule — humidity and watering problems are easy to confuse.