Plant care
Blue Chalkstickstemperature & humidity
Curio repens (syn. Senecio serpens)
More about blue chalksticks
Ideal temperature for blue chalksticks
Temperature kills fewer blue chalksticks 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 15-29 C (60-85 F) is fine; the spot you put the plant in matters more. Below roughly 15°C the damage starts — soft blackened patches, translucent leaves, sometimes overnight.
Cold tolerance & winter care
Blue Chalksticks is frost-tender (USDA USDA zones 9-11 (frost-tender; tolerates brief dips to roughly -7 C / 20 F but is damaged by hard frost). Grow as an indoor or container plant outside zones 9-11 and protect from freezing., RHS undefined). 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 blue chalksticks
Blue Chalksticks sits happiest at around Around 30-50%; average household humidity is fine. relative humidity. As a dry-climate succulent from the South African Cape it prefers low to moderate humidity with good airflow and dislikes damp, stagnant conditions. There is no need to mist; surplus moisture on the leaves and crowded stems only invites rot and fungal problems. 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.
Blue Chalksticks temperature & humidity — frequently asked questions
What temperature is best for blue chalksticks?
Blue Chalksticks grows best between 15-29 C (60-85 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 blue chalksticks tolerate?
Blue Chalksticks starts to suffer below roughly 15°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 blue chalksticks need?
Blue Chalksticks prefers about Around 30-50%; average household humidity is fine. relative humidity. As a dry-climate succulent from the South African Cape it prefers low to moderate humidity with good airflow and dislikes damp, stagnant conditions. There is no need to mist; surplus moisture on the leaves and crowded stems only invites rot and fungal problems.
How do I raise humidity for blue chalksticks?
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 blue chalksticks live outside?
Blue Chalksticks is rated for USDA zone USDA zones 9-11 (frost-tender; tolerates brief dips to roughly -7 C / 20 F but is damaged by hard frost). Grow as an indoor or container plant outside zones 9-11 and protect from freezing.. Outside that range it must come indoors before the first frost — treat any outdoor stint as a summer holiday, not a permanent home.
More blue chalksticks care
In the UK? Keeping blue chalksticks warm in a UK home covers the radiator, single-glazing and heating-season humidity angle. Temperature and humidity are one piece. See the full blue chalksticks care guide, its cold-hardiness guide, and watering schedule — humidity and watering problems are easy to confuse.