Plant care
Common Tussock Grasstemperature & humidity
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More about common tussock grass
Ideal temperature for common tussock grass
Common Tussock Grass is comfortable in any room a person is comfortable in, roughly −12°C to 42°C (10°F to 108°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 12°C growth pauses; cold beyond that pushes it into dormancy rather than killing it outright.
Cold tolerance & winter care
Common Tussock 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 common tussock grass
Common Tussock Grass sits happiest at around 30–75% relative humidity. Native to southeastern Australia, including coastal, subalpine, and semi-arid zones, giving it a broad humidity tolerance. Performs well in both maritime humid conditions and drier inland sites. No humidity modification 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.
Common Tussock Grass temperature & humidity — frequently asked questions
What temperature is best for common tussock grass?
Common Tussock Grass grows best between −12°C to 42°C (10°F to 108°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 common tussock grass tolerate?
Common Tussock Grass starts to suffer below roughly 12°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 common tussock grass need?
Common Tussock Grass prefers about 30–75% relative humidity. Native to southeastern Australia, including coastal, subalpine, and semi-arid zones, giving it a broad humidity tolerance. Performs well in both maritime humid conditions and drier inland sites. No humidity modification required.
How do I raise humidity for common tussock 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 common tussock grass live outside?
Common Tussock 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 common tussock grass care
In the UK? Keeping common tussock 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 common tussock grass care guide, its cold-hardiness guide, and watering schedule — humidity and watering problems are easy to confuse.