Plant care
Queen Mix Spider Flowertemperature & humidity
Cleome hassleriana
More about queen mix spider flower
Ideal temperature for queen mix spider flower
Aim for 18-32°C (65-90°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 18°C the damage starts — soft blackened patches, translucent leaves, sometimes overnight.
Cold tolerance & winter care
Queen Mix Spider Flower is frost-tender (USDA 2-11 (frost-tender annual, self-seeds in zones 7+), RHS H2). 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 queen mix spider flower
Queen Mix Spider Flower sits happiest at around 40-65% relative humidity. Adaptable to a wide range of humidity levels; hot and dry conditions are tolerated well. Very high, stagnant humidity can encourage powdery mildew on the large leaves. Open, airy planting in full sun naturally prevents most 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.
Queen Mix Spider Flower temperature & humidity — frequently asked questions
What temperature is best for queen mix spider flower?
Queen Mix Spider Flower grows best between 18-32°C (65-90°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 queen mix spider flower tolerate?
Queen Mix Spider Flower 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 queen mix spider flower need?
Queen Mix Spider Flower prefers about 40-65% relative humidity. Adaptable to a wide range of humidity levels; hot and dry conditions are tolerated well. Very high, stagnant humidity can encourage powdery mildew on the large leaves. Open, airy planting in full sun naturally prevents most fungal issues.
How do I raise humidity for queen mix spider flower?
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 queen mix spider flower live outside?
Queen Mix Spider Flower is rated for USDA zone 2-11 (frost-tender annual, self-seeds in zones 7+) and RHS hardiness H2. Outside that range it must come indoors before the first frost — treat any outdoor stint as a summer holiday, not a permanent home.
More queen mix spider flower care
In the UK? Keeping queen mix spider flower warm in a UK home covers the radiator, single-glazing and heating-season humidity angle. Temperature and humidity are one piece. See the full queen mix spider flower care guide, its cold-hardiness guide, and watering schedule — humidity and watering problems are easy to confuse.