Plant care
Ravenna Grasstemperature & humidity
Saccharum ravennae
More about ravenna grass
Ideal temperature for ravenna grass
Temperature kills fewer ravenna 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 -20 to 35°C (-4 to 95°F) is fine; the spot you put the plant in matters more. Below roughly -20°C growth pauses; cold beyond that pushes it into dormancy rather than killing it outright.
Cold tolerance & winter care
Ravenna Grass is comparatively hardy (USDA 6-9 (root-hardy, dies back to ground each winter in colder zones), 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 ravenna grass
Ravenna Grass sits happiest at around Ambient outdoor relative humidity. An outdoor landscape grass indifferent to humidity. It performs across humid and arid climates alike; good air movement around the clump helps prevent foliar disease. 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.
Ravenna Grass temperature & humidity — frequently asked questions
What temperature is best for ravenna grass?
Ravenna Grass grows best between -20 to 35°C (-4 to 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 ravenna grass tolerate?
Ravenna Grass starts to suffer below roughly -20°C. It tolerates a cold dormant period within USDA 6-9 (root-hardy, dies back to ground each winter in colder zones), but a wet cold root zone is more dangerous than cold air.
What humidity does ravenna grass need?
Ravenna Grass prefers about Ambient outdoor relative humidity. An outdoor landscape grass indifferent to humidity. It performs across humid and arid climates alike; good air movement around the clump helps prevent foliar disease.
How do I raise humidity for ravenna 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 ravenna grass live outside?
Ravenna Grass is rated for USDA zone 6-9 (root-hardy, dies back to ground each winter in colder zones) 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 ravenna grass care
In the UK? Keeping ravenna 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 ravenna grass care guide, its cold-hardiness guide, and watering schedule — humidity and watering problems are easy to confuse.