Plant care
Concrete Leaftemperature & humidity
Titanopsis calcarea
More about concrete leaf
Ideal temperature for concrete leaf
Temperature kills fewer concrete leaf 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 18-27C in growth; 10-16C during dormancy (65-80F in growth; 50-60F during dormancy) is fine; the spot you put the plant in matters more. Below roughly 18°C growth pauses; cold beyond that pushes it into dormancy rather than killing it outright.
Cold tolerance & winter care
Concrete Leaf is comparatively hardy (USDA USDA 9b-11 outdoors (some sources cite 8b with bone-dry winter protection); RHS hardiness H1C, so in the UK it is tender and best grown under glass, moved outside only in warm summer months., RHS undefined). 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 concrete leaf
Concrete Leaf sits happiest at around Low, ideally below 40% relative humidity. A desert succulent that prefers dry air and dislikes humid, stagnant conditions. Give it good airflow and avoid crowding pots together, especially when humidity climbs, to prevent rot and 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.
Concrete Leaf temperature & humidity — frequently asked questions
What temperature is best for concrete leaf?
Concrete Leaf grows best between 18-27C in growth; 10-16C during dormancy (65-80F in growth; 50-60F during dormancy). 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 concrete leaf tolerate?
Concrete Leaf starts to suffer below roughly 18°C. It tolerates a cold dormant period within USDA USDA 9b-11 outdoors (some sources cite 8b with bone-dry winter protection); RHS hardiness H1C, so in the UK it is tender and best grown under glass, moved outside only in warm summer months., but a wet cold root zone is more dangerous than cold air.
What humidity does concrete leaf need?
Concrete Leaf prefers about Low, ideally below 40% relative humidity. A desert succulent that prefers dry air and dislikes humid, stagnant conditions. Give it good airflow and avoid crowding pots together, especially when humidity climbs, to prevent rot and fungal issues.
How do I raise humidity for concrete leaf?
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 concrete leaf live outside?
Concrete Leaf is rated for USDA zone USDA 9b-11 outdoors (some sources cite 8b with bone-dry winter protection); RHS hardiness H1C, so in the UK it is tender and best grown under glass, moved outside only in warm summer months.. 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 concrete leaf care
In the UK? Keeping concrete leaf warm in a UK home covers the radiator, single-glazing and heating-season humidity angle. Temperature and humidity are one piece. See the full concrete leaf care guide, its cold-hardiness guide, and watering schedule — humidity and watering problems are easy to confuse.