Plant care
Titan Arumtemperature & humidity
Amorphophallus titanum
More about titan arum
Ideal temperature for titan arum
Temperature kills fewer titan arum 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 24-32°C (75-90°F) is fine; the spot you put the plant in matters more. Below roughly 24°C the damage starts — soft blackened patches, translucent leaves, sometimes overnight.
Cold tolerance & winter care
Titan Arum is frost-tender (USDA 11-12 (heated greenhouse only outside the tropics), RHS H1a). It cannot survive a frost, so in most of the US and UK it lives indoors year-round or summers outside and comes back in well before the first autumn frost — once nights drop toward 10-12°C is the cue, not the first frost warning. Acclimate it over a week when moving between indoors and out so the leaves do not shock.
Humidity for titan arum
Titan Arum sits happiest at around 70-90% relative humidity. Demands consistently high tropical humidity, ideally above 70%. It is essentially a heated-greenhouse or conservatory plant in temperate climates; ordinary room air is too dry for sustained healthy growth. 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.
Titan Arum temperature & humidity — frequently asked questions
What temperature is best for titan arum?
Titan Arum grows best between 24-32°C (75-90°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 titan arum tolerate?
Titan Arum starts to suffer below roughly 24°C. It is frost-tender and will be damaged or killed by a frost, so bring it indoors once nights fall toward 10-12°C.
What humidity does titan arum need?
Titan Arum prefers about 70-90% relative humidity. Demands consistently high tropical humidity, ideally above 70%. It is essentially a heated-greenhouse or conservatory plant in temperate climates; ordinary room air is too dry for sustained healthy growth.
How do I raise humidity for titan 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 titan arum live outside?
Titan Arum is rated for USDA zone 11-12 (heated greenhouse only outside the tropics) and RHS hardiness H1a. Outside that range it must come indoors before the first frost — treat any outdoor stint as a summer holiday, not a permanent home.
More titan arum care
In the UK? Keeping titan 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 titan arum care guide, its cold-hardiness guide, and watering schedule — humidity and watering problems are easy to confuse.