Plant care
Begonia 'Nonstop Red'temperature & humidity
Begonia × tuberhybrida 'Nonstop Red'
More about begonia 'nonstop red'
Ideal temperature for begonia 'nonstop red'
Temperature kills fewer begonia 'nonstop red' 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 16-24°C (60-75°F) is fine; the spot you put the plant in matters more. Below roughly 16°C the damage starts — soft blackened patches, translucent leaves, sometimes overnight.
Cold tolerance & winter care
Begonia 'Nonstop Red' is frost-tender (USDA 9-11 (frost-tender; grown as a summer plant, lift tubers below zone 9), 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 begonia 'nonstop red'
Begonia 'Nonstop Red' sits happiest at around 50-60% relative humidity. Moderate humidity keeps the foliage and double flowers fresh; very dry, hot air causes bud drop and leaf-edge browning. Avoid wetting the dense flowerheads, which encourages powdery mildew and botrytis. Maintain good airflow between plants and raise ambient humidity rather than misting the foliage directly. 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.
Begonia 'Nonstop Red' temperature & humidity — frequently asked questions
What temperature is best for begonia 'nonstop red'?
Begonia 'Nonstop Red' grows best between 16-24°C (60-75°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 begonia 'nonstop red' tolerate?
Begonia 'Nonstop Red' starts to suffer below roughly 16°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 begonia 'nonstop red' need?
Begonia 'Nonstop Red' prefers about 50-60% relative humidity. Moderate humidity keeps the foliage and double flowers fresh; very dry, hot air causes bud drop and leaf-edge browning. Avoid wetting the dense flowerheads, which encourages powdery mildew and botrytis. Maintain good airflow between plants and raise ambient humidity rather than misting the foliage directly.
How do I raise humidity for begonia 'nonstop red'?
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 begonia 'nonstop red' live outside?
Begonia 'Nonstop Red' is rated for USDA zone 9-11 (frost-tender; grown as a summer plant, lift tubers below zone 9) 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 begonia 'nonstop red' care
In the UK? Keeping begonia 'nonstop red' warm in a UK home covers the radiator, single-glazing and heating-season humidity angle. Temperature and humidity are one piece. See the full begonia 'nonstop red' care guide, its cold-hardiness guide, and watering schedule — humidity and watering problems are easy to confuse.