Plant care
Pyrenean Rock Jasminetemperature & humidity
Androsace pyrenaica
More about pyrenean rock jasmine
Ideal temperature for pyrenean rock jasmine
Aim for -20 to 18°C (-4 to 64°F) on the thermostat and you've handled the easy part. The hard part is the half-metre around the plant: window glass that drops to near-freezing on a January night, a radiator pumping out hot dry air, a draught from an opened front door. Move the plant 30 cm and you've usually fixed the problem. Below roughly -20°C growth pauses; cold beyond that pushes it into dormancy rather than killing it outright.
Cold tolerance & winter care
Pyrenean Rock Jasmine is comparatively hardy (USDA 5-8, RHS H5). 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 pyrenean rock jasmine
Pyrenean Rock Jasmine sits happiest at around Low (20–40% RH) relative humidity. Like all high-alpine Androsace, it is very susceptible to fungal problems in humid, stagnant air; good ventilation and a sheltered but airy position are essential for success. 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.
Pyrenean Rock Jasmine temperature & humidity — frequently asked questions
What temperature is best for pyrenean rock jasmine?
Pyrenean Rock Jasmine grows best between -20 to 18°C (-4 to 64°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 pyrenean rock jasmine tolerate?
Pyrenean Rock Jasmine starts to suffer below roughly -20°C. It tolerates a cold dormant period within USDA 5-8, but a wet cold root zone is more dangerous than cold air.
What humidity does pyrenean rock jasmine need?
Pyrenean Rock Jasmine prefers about Low (20–40% RH) relative humidity. Like all high-alpine Androsace, it is very susceptible to fungal problems in humid, stagnant air; good ventilation and a sheltered but airy position are essential for success.
How do I raise humidity for pyrenean rock jasmine?
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 pyrenean rock jasmine live outside?
Pyrenean Rock Jasmine is rated for USDA zone 5-8 and RHS hardiness H5. 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 pyrenean rock jasmine care
In the UK? Keeping pyrenean rock jasmine warm in a UK home covers the radiator, single-glazing and heating-season humidity angle. Temperature and humidity are one piece. See the full pyrenean rock jasmine care guide, its cold-hardiness guide, and watering schedule — humidity and watering problems are easy to confuse.