Plant care
Crassula Hummel's Sunsettemperature & humidity
Crassula ovata 'Hummel's Sunset'
More about crassula hummel's sunset
Ideal temperature for crassula hummel's sunset
Temperature kills fewer crassula hummel's sunset 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 18-24°C (65-75°F) is fine; the spot you put the plant in matters more. Below roughly 18°C the damage starts — soft blackened patches, translucent leaves, sometimes overnight.
Cold tolerance & winter care
Crassula Hummel's Sunset is frost-tender (USDA 10-11 (indoor in most US homes), RHS H1c). It cannot survive a frost, so in most of the US and UK it lives indoors year-round or summers outside and comes back in well before the first autumn frost — once nights drop toward 10-12°C is the cue, not the first frost warning. Acclimate it over a week when moving between indoors and out so the leaves do not shock.
Humidity for crassula hummel's sunset
Crassula Hummel's Sunset sits happiest at around 30-50% relative humidity. Prefers dry to average household air and dislikes humid, stagnant conditions. No misting is needed; good airflow helps prevent fungal problems and keeps the fleshy leaves firm. 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.
Crassula Hummel's Sunset temperature & humidity — frequently asked questions
What temperature is best for crassula hummel's sunset?
Crassula Hummel's Sunset grows best between 18-24°C (65-75°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 crassula hummel's sunset tolerate?
Crassula Hummel's Sunset starts to suffer below roughly 18°C. It is frost-tender and will be damaged or killed by a frost, so bring it indoors once nights fall toward 10-12°C.
What humidity does crassula hummel's sunset need?
Crassula Hummel's Sunset prefers about 30-50% relative humidity. Prefers dry to average household air and dislikes humid, stagnant conditions. No misting is needed; good airflow helps prevent fungal problems and keeps the fleshy leaves firm.
How do I raise humidity for crassula hummel's sunset?
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 crassula hummel's sunset live outside?
Crassula Hummel's Sunset is rated for USDA zone 10-11 (indoor in most US homes) and RHS hardiness H1c. Outside that range it must come indoors before the first frost — treat any outdoor stint as a summer holiday, not a permanent home.
More crassula hummel's sunset care
In the UK? Keeping crassula hummel's sunset warm in a UK home covers the radiator, single-glazing and heating-season humidity angle. Temperature and humidity are one piece. See the full crassula hummel's sunset care guide, its cold-hardiness guide, and watering schedule — humidity and watering problems are easy to confuse.