Plant care
Hairy Sun Rosetemperature & humidity
Halimium lasianthum
More about hairy sun rose
Ideal temperature for hairy sun rose
Temperature kills fewer hairy sun rose 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 -8 to 38 °C (18 to 100 °F) is fine; the spot you put the plant in matters more. Below roughly -8°C growth pauses; cold beyond that pushes it into dormancy rather than killing it outright.
Cold tolerance & winter care
Hairy Sun Rose is comparatively hardy (USDA 8-10, RHS H4). 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 hairy sun rose
Hairy Sun Rose sits happiest at around Low (25–50% RH) relative humidity. Adapted to the dry, low-humidity conditions of the Iberian Peninsula; in humid UK climates ensure a fully open, sunny, free-draining site to minimise fungal issues. 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.
Hairy Sun Rose temperature & humidity — frequently asked questions
What temperature is best for hairy sun rose?
Hairy Sun Rose grows best between -8 to 38 °C (18 to 100 °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 hairy sun rose tolerate?
Hairy Sun Rose starts to suffer below roughly -8°C. It tolerates a cold dormant period within USDA 8-10, but a wet cold root zone is more dangerous than cold air.
What humidity does hairy sun rose need?
Hairy Sun Rose prefers about Low (25–50% RH) relative humidity. Adapted to the dry, low-humidity conditions of the Iberian Peninsula; in humid UK climates ensure a fully open, sunny, free-draining site to minimise fungal issues.
How do I raise humidity for hairy sun rose?
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 hairy sun rose live outside?
Hairy Sun Rose is rated for USDA zone 8-10 and RHS hardiness H4. 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 hairy sun rose care
In the UK? Keeping hairy sun rose warm in a UK home covers the radiator, single-glazing and heating-season humidity angle. Temperature and humidity are one piece. See the full hairy sun rose care guide, its cold-hardiness guide, and watering schedule — humidity and watering problems are easy to confuse.