Plant care
Begonia 'Black Velvet'temperature & humidity
Begonia rex-cultorum 'Black Velvet'
More about begonia 'black velvet'
Ideal temperature for begonia 'black velvet'
Temperature kills fewer begonia 'black velvet' 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 18-24°C (64-75°F) is fine; the spot you put the plant in matters more. Below roughly 18°C the damage starts — soft blackened patches, translucent leaves, sometimes overnight.
Cold tolerance & winter care
Begonia 'Black Velvet' is frost-tender (USDA 10-11 (indoor in most US homes), RHS H1b). 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 'black velvet'
Begonia 'Black Velvet' sits happiest at around 50-70% relative humidity. Prefers above-average humidity for full, unblemished leaves. Use a pebble tray or grouping; avoid misting the velvety foliage directly, which encourages mildew and leaf spotting. 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 'Black Velvet' temperature & humidity — frequently asked questions
What temperature is best for begonia 'black velvet'?
Begonia 'Black Velvet' grows best between 18-24°C (64-75°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 'black velvet' tolerate?
Begonia 'Black Velvet' 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 begonia 'black velvet' need?
Begonia 'Black Velvet' prefers about 50-70% relative humidity. Prefers above-average humidity for full, unblemished leaves. Use a pebble tray or grouping; avoid misting the velvety foliage directly, which encourages mildew and leaf spotting.
How do I raise humidity for begonia 'black velvet'?
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 'black velvet' live outside?
Begonia 'Black Velvet' is rated for USDA zone 10-11 (indoor in most US homes) and RHS hardiness H1b. 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 'black velvet' care
In the UK? Keeping begonia 'black velvet' 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 'black velvet' care guide, its cold-hardiness guide, and watering schedule — humidity and watering problems are easy to confuse.