Plant care
Pumila Pampas Grasstemperature & humidity
Cortaderia selloana 'Pumila'
More about pumila pampas grass
Ideal temperature for pumila pampas grass
Temperature kills fewer pumila pampas 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 −15–35°C (5–95°F) is fine; the spot you put the plant in matters more. Below roughly 15°C growth pauses; cold beyond that pushes it into dormancy rather than killing it outright.
Cold tolerance & winter care
Pumila Pampas Grass is comparatively hardy (USDA 7-11, RHS H5). 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 pumila pampas grass
Pumila Pampas Grass sits happiest at around 30-60% relative humidity. Tolerates a wide range of ambient humidity. No supplemental humidity required; this is an outdoor ornamental grass suited to typical garden 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.
Pumila Pampas Grass temperature & humidity — frequently asked questions
What temperature is best for pumila pampas grass?
Pumila Pampas Grass grows best between −15–35°C (5–95°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 pumila pampas grass tolerate?
Pumila Pampas Grass starts to suffer below roughly 15°C. It tolerates a cold dormant period within USDA 7-11, but a wet cold root zone is more dangerous than cold air.
What humidity does pumila pampas grass need?
Pumila Pampas Grass prefers about 30-60% relative humidity. Tolerates a wide range of ambient humidity. No supplemental humidity required; this is an outdoor ornamental grass suited to typical garden conditions.
How do I raise humidity for pumila pampas 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 pumila pampas grass live outside?
Pumila Pampas Grass is rated for USDA zone 7-11 and RHS hardiness H5. 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 pumila pampas grass care
In the UK? Keeping pumila pampas 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 pumila pampas grass care guide, its cold-hardiness guide, and watering schedule — humidity and watering problems are easy to confuse.