Plant care
Rocky Mountain Douglas Firtemperature & humidity
Pseudotsuga menziesii var. glauca
More about rocky mountain douglas fir
Ideal temperature for rocky mountain douglas fir
Temperature kills fewer rocky mountain douglas fir 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 -45°C to 30°C (-49°F to 86°F) is fine; the spot you put the plant in matters more. Below roughly -45°C growth pauses; cold beyond that pushes it into dormancy rather than killing it outright.
Cold tolerance & winter care
Rocky Mountain Douglas Fir is comparatively hardy (USDA 3-7, 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 rocky mountain douglas fir
Rocky Mountain Douglas Fir sits happiest at around Low to moderate ambient (25–65%) relative humidity. Adapted to the lower humidity of the continental interior and Rocky Mountain slopes. More tolerant of dry air than the coastal variety. Performs well in cold, dry, temperate climates across a wide elevation range. 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.
Rocky Mountain Douglas Fir temperature & humidity — frequently asked questions
What temperature is best for rocky mountain douglas fir?
Rocky Mountain Douglas Fir grows best between -45°C to 30°C (-49°F to 86°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 rocky mountain douglas fir tolerate?
Rocky Mountain Douglas Fir starts to suffer below roughly -45°C. It tolerates a cold dormant period within USDA 3-7, but a wet cold root zone is more dangerous than cold air.
What humidity does rocky mountain douglas fir need?
Rocky Mountain Douglas Fir prefers about Low to moderate ambient (25–65%) relative humidity. Adapted to the lower humidity of the continental interior and Rocky Mountain slopes. More tolerant of dry air than the coastal variety. Performs well in cold, dry, temperate climates across a wide elevation range.
How do I raise humidity for rocky mountain douglas fir?
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 rocky mountain douglas fir live outside?
Rocky Mountain Douglas Fir is rated for USDA zone 3-7 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 rocky mountain douglas fir care
In the UK? Keeping rocky mountain douglas fir warm in a UK home covers the radiator, single-glazing and heating-season humidity angle. Temperature and humidity are one piece. See the full rocky mountain douglas fir care guide, its cold-hardiness guide, and watering schedule — humidity and watering problems are easy to confuse.