Plant care
Four-angled cassiopetemperature & humidity
Cassiope tetragona
More about four-angled cassiope
Ideal temperature for four-angled cassiope
Temperature kills fewer four-angled cassiope 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 −30 to 15°C (−22 to 59°F) is fine; the spot you put the plant in matters more. Below roughly 30°C growth pauses; cold beyond that pushes it into dormancy rather than killing it outright.
Cold tolerance & winter care
Four-angled cassiope is comparatively hardy (USDA 2-6, 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 four-angled cassiope
Four-angled cassiope sits happiest at around Moderate to high (50–80% RH) relative humidity. Native to arctic tundra and alpine zones where cool, humid air is the norm. In cultivation, avoid hot, dry indoor environments. Suited to cool temperate outdoor rock gardens or alpine houses. 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.
Four-angled cassiope temperature & humidity — frequently asked questions
What temperature is best for four-angled cassiope?
Four-angled cassiope grows best between −30 to 15°C (−22 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 four-angled cassiope tolerate?
Four-angled cassiope starts to suffer below roughly 30°C. It tolerates a cold dormant period within USDA 2-6, but a wet cold root zone is more dangerous than cold air.
What humidity does four-angled cassiope need?
Four-angled cassiope prefers about Moderate to high (50–80% RH) relative humidity. Native to arctic tundra and alpine zones where cool, humid air is the norm. In cultivation, avoid hot, dry indoor environments. Suited to cool temperate outdoor rock gardens or alpine houses.
How do I raise humidity for four-angled cassiope?
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 four-angled cassiope live outside?
Four-angled cassiope is rated for USDA zone 2-6 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 four-angled cassiope care
In the UK? Keeping four-angled cassiope warm in a UK home covers the radiator, single-glazing and heating-season humidity angle. Temperature and humidity are one piece. See the full four-angled cassiope care guide, its cold-hardiness guide, and watering schedule — humidity and watering problems are easy to confuse.