Plant care
African feather grasstemperature & humidity
Pennisetum macrourum
More about african feather grass
Ideal temperature for african feather grass
Temperature kills fewer african feather 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 5–35°C (41–95°F) is fine; the spot you put the plant in matters more. Below roughly 5°C growth pauses; cold beyond that pushes it into dormancy rather than killing it outright.
Cold tolerance & winter care
African feather grass is comparatively hardy (USDA 8–10, RHS H3). 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 african feather grass
African feather grass sits happiest at around 30–60% relative humidity. Tolerant of a wide humidity range. Performs best in moderate to low humidity; high humidity combined with wet soil increases disease risk. No misting or humidity supplementation required. 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.
African feather grass temperature & humidity — frequently asked questions
What temperature is best for african feather grass?
African feather grass grows best between 5–35°C (41–95°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 african feather grass tolerate?
African feather grass starts to suffer below roughly 5°C. It tolerates a cold dormant period within USDA 8–10, but a wet cold root zone is more dangerous than cold air.
What humidity does african feather grass need?
African feather grass prefers about 30–60% relative humidity. Tolerant of a wide humidity range. Performs best in moderate to low humidity; high humidity combined with wet soil increases disease risk. No misting or humidity supplementation required.
How do I raise humidity for african feather 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 african feather grass live outside?
African feather grass is rated for USDA zone 8–10 and RHS hardiness H3. 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 african feather grass care
In the UK? Keeping african feather 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 african feather grass care guide, its cold-hardiness guide, and watering schedule — humidity and watering problems are easy to confuse.