Plant care
Alan Fradd Rock Rosetemperature & humidity
Cistus × purpureus 'Alan Fradd'
More about alan fradd rock rose
Ideal temperature for alan fradd rock rose
Aim for -10 to 35°C (14 to 95°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 -10°C growth pauses; cold beyond that pushes it into dormancy rather than killing it outright.
Cold tolerance & winter care
Alan Fradd Rock Rose is comparatively hardy (USDA 7-10, 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 alan fradd rock rose
Alan Fradd Rock Rose sits happiest at around Low to moderate, 30–60% relative humidity. Handles maritime and coastal humidity well as long as drainage is sharp and the site is fully open to the sun. Inland in wetter climates, ensure the plant has good air movement around it to prevent fungal problems at the collar. 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.
Alan Fradd Rock Rose temperature & humidity — frequently asked questions
What temperature is best for alan fradd rock rose?
Alan Fradd Rock Rose grows best between -10 to 35°C (14 to 95°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 alan fradd rock rose tolerate?
Alan Fradd Rock Rose starts to suffer below roughly -10°C. It tolerates a cold dormant period within USDA 7-10, but a wet cold root zone is more dangerous than cold air.
What humidity does alan fradd rock rose need?
Alan Fradd Rock Rose prefers about Low to moderate, 30–60% relative humidity. Handles maritime and coastal humidity well as long as drainage is sharp and the site is fully open to the sun. Inland in wetter climates, ensure the plant has good air movement around it to prevent fungal problems at the collar.
How do I raise humidity for alan fradd rock 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 alan fradd rock rose live outside?
Alan Fradd Rock Rose is rated for USDA zone 7-10 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 alan fradd rock rose care
In the UK? Keeping alan fradd rock 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 alan fradd rock rose care guide, its cold-hardiness guide, and watering schedule — humidity and watering problems are easy to confuse.