Plant care
Winter Melontemperature & humidity
Benincasa hispida
More about winter melon
Ideal temperature for winter melon
Aim for 24–35°C (75–95°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 24°C the damage starts — soft blackened patches, translucent leaves, sometimes overnight.
Cold tolerance & winter care
Winter Melon is frost-tender (USDA 9–12 (warm-season annual in cooler zones), 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 winter melon
Winter Melon sits happiest at around 50–80% relative humidity. Best in warm, moderately humid conditions typical of the humid subtropics and tropics. In low humidity environments, mulch generously and water consistently. Ensure good air circulation to reduce risk of fungal disease on the large leaf canopy. 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.
Winter Melon temperature & humidity — frequently asked questions
What temperature is best for winter melon?
Winter Melon grows best between 24–35°C (75–95°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 winter melon tolerate?
Winter Melon starts to suffer below roughly 24°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 winter melon need?
Winter Melon prefers about 50–80% relative humidity. Best in warm, moderately humid conditions typical of the humid subtropics and tropics. In low humidity environments, mulch generously and water consistently. Ensure good air circulation to reduce risk of fungal disease on the large leaf canopy.
How do I raise humidity for winter melon?
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 winter melon live outside?
Winter Melon is rated for USDA zone 9–12 (warm-season annual in cooler zones) 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 winter melon care
In the UK? Keeping winter melon warm in a UK home covers the radiator, single-glazing and heating-season humidity angle. Temperature and humidity are one piece. See the full winter melon care guide, its cold-hardiness guide, and watering schedule — humidity and watering problems are easy to confuse.