Plant care
'Painted Mountain' Corntemperature & humidity
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More about 'painted mountain' corn
Ideal temperature for 'painted mountain' corn
'Painted Mountain' Corn is comfortable in any room a person is comfortable in, roughly 16-30°C (60-86°F). The mistakes are micro-climates: a north-facing window on a frosty night, a south-facing windowsill in a summer heatwave, the standing draught between an opened kitchen door and the radiator behind it. Read the room around the plant, not the thermostat. Below roughly 16°C the damage starts — soft blackened patches, translucent leaves, sometimes overnight.
Cold tolerance & winter care
'Painted Mountain' Corn is frost-tender (USDA Annual; sow outdoors in zones 3-11 after frost (bred for short, cool seasons), RHS H2 (frost-tender annual)). 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 'painted mountain' corn
'Painted Mountain' Corn sits happiest at around Ambient outdoor relative humidity. An open-field crop indifferent to humidity. Good airflow between rows reduces fungal leaf and ear diseases; very humid, still conditions favour rust and smut. 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.
'Painted Mountain' Corn temperature & humidity — frequently asked questions
What temperature is best for 'painted mountain' corn?
'Painted Mountain' Corn grows best between 16-30°C (60-86°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 'painted mountain' corn tolerate?
'Painted Mountain' Corn starts to suffer below roughly 16°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 'painted mountain' corn need?
'Painted Mountain' Corn prefers about Ambient outdoor relative humidity. An open-field crop indifferent to humidity. Good airflow between rows reduces fungal leaf and ear diseases; very humid, still conditions favour rust and smut.
How do I raise humidity for 'painted mountain' corn?
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 'painted mountain' corn live outside?
'Painted Mountain' Corn is rated for USDA zone Annual; sow outdoors in zones 3-11 after frost (bred for short, cool seasons) and RHS hardiness H2 (frost-tender annual). Outside that range it must come indoors before the first frost — treat any outdoor stint as a summer holiday, not a permanent home.
More 'painted mountain' corn care
In the UK? Keeping 'painted mountain' corn warm in a UK home covers the radiator, single-glazing and heating-season humidity angle. Temperature and humidity are one piece. See the full 'painted mountain' corn care guide, its cold-hardiness guide, and watering schedule — humidity and watering problems are easy to confuse.