Plant care
teff grasstemperature & humidity
Eragrostis tef
More about teff grass
Ideal temperature for teff grass
Temperature kills fewer teff grass 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 15°C to 38°C (optimal 20–30°C for germination and growth; frost kills at any stage) (59°F to 100°F (optimal 68–86°F)) is fine; the spot you put the plant in matters more. Below roughly 15°C the damage starts — soft blackened patches, translucent leaves, sometimes overnight.
Cold tolerance & winter care
teff grass is frost-tender (USDA Annual — grown in zones 4–11 as a summer crop, RHS H1c (tender annual; no frost tolerance at any growth stage)). 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 teff grass
teff grass sits happiest at around Low to moderate (30–65% RH) relative humidity. Native to the Ethiopian Highlands where conditions are seasonally warm and relatively dry during the grain-filling period. Performs well in a wide range of climates during its summer growing window. High humidity during the grain-ripening period can promote fungal head diseases and reduce grain quality. Best harvested in dry conditions. 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.
teff grass temperature & humidity — frequently asked questions
What temperature is best for teff grass?
teff grass grows best between 15°C to 38°C (optimal 20–30°C for germination and growth; frost kills at any stage) (59°F to 100°F (optimal 68–86°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 teff grass tolerate?
teff grass 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 teff grass need?
teff grass prefers about Low to moderate (30–65% RH) relative humidity. Native to the Ethiopian Highlands where conditions are seasonally warm and relatively dry during the grain-filling period. Performs well in a wide range of climates during its summer growing window. High humidity during the grain-ripening period can promote fungal head diseases and reduce grain quality. Best harvested in dry conditions.
How do I raise humidity for teff grass?
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 teff grass live outside?
teff grass is rated for USDA zone Annual — grown in zones 4–11 as a summer crop and RHS hardiness H1c (tender annual; no frost tolerance at any growth stage). Outside that range it must come indoors before the first frost — treat any outdoor stint as a summer holiday, not a permanent home.
More teff grass care
In the UK? Keeping teff grass warm in a UK home covers the radiator, single-glazing and heating-season humidity angle. Temperature and humidity are one piece. See the full teff grass care guide, its cold-hardiness guide, and watering schedule — humidity and watering problems are easy to confuse.