Plant care
Aleutian mountain heathertemperature & humidity
Phyllodoce aleutica
More about aleutian mountain heather
Ideal temperature for aleutian mountain heather
Aleutian mountain heather is comfortable in any room a person is comfortable in, roughly −25 to 15°C (−13 to 59°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 25°C growth pauses; cold beyond that pushes it into dormancy rather than killing it outright.
Cold tolerance & winter care
Aleutian mountain heather is comparatively hardy (USDA 3-6, 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 aleutian mountain heather
Aleutian mountain heather sits happiest at around Moderate to high (55–85% RH) relative humidity. Native to the maritime, fog-prone climate of the Aleutian Islands and adjacent Pacific coast ranges. Cool, humid conditions are optimal. Dry or warm air causes leaf scorch and decline. Maritime gardens in the British Isles or Pacific Northwest suit this species particularly well. 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.
Aleutian mountain heather temperature & humidity — frequently asked questions
What temperature is best for aleutian mountain heather?
Aleutian mountain heather grows best between −25 to 15°C (−13 to 59°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 aleutian mountain heather tolerate?
Aleutian mountain heather starts to suffer below roughly 25°C. It tolerates a cold dormant period within USDA 3-6, but a wet cold root zone is more dangerous than cold air.
What humidity does aleutian mountain heather need?
Aleutian mountain heather prefers about Moderate to high (55–85% RH) relative humidity. Native to the maritime, fog-prone climate of the Aleutian Islands and adjacent Pacific coast ranges. Cool, humid conditions are optimal. Dry or warm air causes leaf scorch and decline. Maritime gardens in the British Isles or Pacific Northwest suit this species particularly well.
How do I raise humidity for aleutian mountain heather?
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 aleutian mountain heather live outside?
Aleutian mountain heather is rated for USDA zone 3-6 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 aleutian mountain heather care
In the UK? Keeping aleutian mountain heather warm in a UK home covers the radiator, single-glazing and heating-season humidity angle. Temperature and humidity are one piece. See the full aleutian mountain heather care guide, its cold-hardiness guide, and watering schedule — humidity and watering problems are easy to confuse.