Plant care
Caucasian Rock Cresstemperature & humidity
Arabis caucasica
More about caucasian rock cress
Ideal temperature for caucasian rock cress
Temperature kills fewer caucasian rock cress 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 -25 to 28°C (-13 to 82°F) is fine; the spot you put the plant in matters more. Below roughly -25°C growth pauses; cold beyond that pushes it into dormancy rather than killing it outright.
Cold tolerance & winter care
Caucasian Rock Cress 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 caucasian rock cress
Caucasian Rock Cress sits happiest at around Low to moderate (30–60% RH) relative humidity. Tolerates a wide range of ambient humidity. Good air circulation reduces the risk of fungal diseases, particularly after the dense spring flowering flush. No supplemental humidity required. 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.
Caucasian Rock Cress temperature & humidity — frequently asked questions
What temperature is best for caucasian rock cress?
Caucasian Rock Cress grows best between -25 to 28°C (-13 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 caucasian rock cress tolerate?
Caucasian Rock Cress starts to suffer below roughly -25°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 caucasian rock cress need?
Caucasian Rock Cress prefers about Low to moderate (30–60% RH) relative humidity. Tolerates a wide range of ambient humidity. Good air circulation reduces the risk of fungal diseases, particularly after the dense spring flowering flush. No supplemental humidity required.
How do I raise humidity for caucasian rock cress?
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 caucasian rock cress live outside?
Caucasian Rock Cress 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 caucasian rock cress care
In the UK? Keeping caucasian rock cress warm in a UK home covers the radiator, single-glazing and heating-season humidity angle. Temperature and humidity are one piece. See the full caucasian rock cress care guide, its cold-hardiness guide, and watering schedule — humidity and watering problems are easy to confuse.