Plant care
Blue Moor Grasstemperature & humidity
Sesleria caerulea
More about blue moor grass
Ideal temperature for blue moor grass
Temperature kills fewer blue moor 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 -34 to 28°C (-30 to 82°F) is fine; the spot you put the plant in matters more. Below roughly -34°C growth pauses; cold beyond that pushes it into dormancy rather than killing it outright.
Cold tolerance & winter care
Blue Moor Grass is comparatively hardy (USDA 4-8, RHS H7). 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 blue moor grass
Blue Moor Grass sits happiest at around Ambient outdoor relative humidity. Hardy outdoor grass unaffected by air humidity; performs across cool, damp maritime and drier continental climates alike. No humidity control is needed. 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.
Blue Moor Grass temperature & humidity — frequently asked questions
What temperature is best for blue moor grass?
Blue Moor Grass grows best between -34 to 28°C (-30 to 82°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 blue moor grass tolerate?
Blue Moor Grass starts to suffer below roughly -34°C. It tolerates a cold dormant period within USDA 4-8, but a wet cold root zone is more dangerous than cold air.
What humidity does blue moor grass need?
Blue Moor Grass prefers about Ambient outdoor relative humidity. Hardy outdoor grass unaffected by air humidity; performs across cool, damp maritime and drier continental climates alike. No humidity control is needed.
How do I raise humidity for blue moor 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 blue moor grass live outside?
Blue Moor Grass is rated for USDA zone 4-8 and RHS hardiness H7. 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 blue moor grass care
In the UK? Keeping blue moor 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 blue moor grass care guide, its cold-hardiness guide, and watering schedule — humidity and watering problems are easy to confuse.