Plant care
Lobster Flowertemperature & humidity
Plectranthus neochilus
More about lobster flower
Ideal temperature for lobster flower
Aim for 7–30°C (45–86°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 7°C the damage starts — soft blackened patches, translucent leaves, sometimes overnight.
Cold tolerance & winter care
Lobster Flower is frost-tender (USDA 9a–10b, 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 lobster flower
Lobster Flower sits happiest at around Low to moderate (30–50%) relative humidity. Tolerates dry indoor air comfortably and does not require misting; good airflow around the plant reduces risk of fungal disease. 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.
Lobster Flower temperature & humidity — frequently asked questions
What temperature is best for lobster flower?
Lobster Flower grows best between 7–30°C (45–86°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 lobster flower tolerate?
Lobster Flower starts to suffer below roughly 7°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 lobster flower need?
Lobster Flower prefers about Low to moderate (30–50%) relative humidity. Tolerates dry indoor air comfortably and does not require misting; good airflow around the plant reduces risk of fungal disease.
How do I raise humidity for lobster 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 lobster flower live outside?
Lobster Flower is rated for USDA zone 9a–10b 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 lobster flower care
In the UK? Keeping lobster 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 lobster flower care guide, its cold-hardiness guide, and watering schedule — humidity and watering problems are easy to confuse.