Plant care
Tsao-Ko Cardamomtemperature & humidity
Amomum tsao-ko
More about tsao-ko cardamom
Ideal temperature for tsao-ko cardamom
Aim for 15-28°C (59-82°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 the damage starts — soft blackened patches, translucent leaves, sometimes overnight.
Cold tolerance & winter care
Tsao-Ko Cardamom is frost-tender (USDA 9-11 (tolerates brief cool spells but not frost; best in USDA 10-11 outdoors), RHS H2). 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 tsao-ko cardamom
Tsao-Ko Cardamom sits happiest at around 65-80% relative humidity. High ambient humidity mirrors the species' native montane forest environment. Brown leaf edges indicate conditions that are too dry. Run a humidifier or place plants on a large pebble tray with water for best results. 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.
Tsao-Ko Cardamom temperature & humidity — frequently asked questions
What temperature is best for tsao-ko cardamom?
Tsao-Ko Cardamom grows best between 15-28°C (59-82°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 tsao-ko cardamom tolerate?
Tsao-Ko Cardamom starts to suffer below roughly 15°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 tsao-ko cardamom need?
Tsao-Ko Cardamom prefers about 65-80% relative humidity. High ambient humidity mirrors the species' native montane forest environment. Brown leaf edges indicate conditions that are too dry. Run a humidifier or place plants on a large pebble tray with water for best results.
How do I raise humidity for tsao-ko cardamom?
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 tsao-ko cardamom live outside?
Tsao-Ko Cardamom is rated for USDA zone 9-11 (tolerates brief cool spells but not frost; best in USDA 10-11 outdoors) and RHS hardiness H2. Outside that range it must come indoors before the first frost — treat any outdoor stint as a summer holiday, not a permanent home.
More tsao-ko cardamom care
In the UK? Keeping tsao-ko cardamom warm in a UK home covers the radiator, single-glazing and heating-season humidity angle. Temperature and humidity are one piece. See the full tsao-ko cardamom care guide, its cold-hardiness guide, and watering schedule — humidity and watering problems are easy to confuse.