Plant care
Blue Potato Bushtemperature & humidity
Lycianthes rantonnetii
More about blue potato bush
Ideal temperature for blue potato bush
Blue Potato Bush is comfortable in any room a person is comfortable in, roughly 10-32°C (50-90°F). The mistakes are micro-climates: a north-facing window on a frosty night, a south-facing windowsill in a summer heatwave, the standing draught between an opened kitchen door and the radiator behind it. Read the room around the plant, not the thermostat. Below roughly 10°C the damage starts — soft blackened patches, translucent leaves, sometimes overnight.
Cold tolerance & winter care
Blue Potato Bush is frost-tender (USDA 9-11, 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 blue potato bush
Blue Potato Bush sits happiest at around 40-65% relative humidity. Tolerates typical outdoor and indoor ambient humidity in warm climates. Not especially demanding; normal household humidity is fine for container specimens. In very dry heated rooms below 35% RH, leaf-tip browning may appear. Outdoors in its natural climate, ambient humidity suffices. 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.
Blue Potato Bush temperature & humidity — frequently asked questions
What temperature is best for blue potato bush?
Blue Potato Bush grows best between 10-32°C (50-90°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 blue potato bush tolerate?
Blue Potato Bush starts to suffer below roughly 10°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 blue potato bush need?
Blue Potato Bush prefers about 40-65% relative humidity. Tolerates typical outdoor and indoor ambient humidity in warm climates. Not especially demanding; normal household humidity is fine for container specimens. In very dry heated rooms below 35% RH, leaf-tip browning may appear. Outdoors in its natural climate, ambient humidity suffices.
How do I raise humidity for blue potato bush?
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 blue potato bush live outside?
Blue Potato Bush is rated for USDA zone 9-11 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 blue potato bush care
In the UK? Keeping blue potato bush warm in a UK home covers the radiator, single-glazing and heating-season humidity angle. Temperature and humidity are one piece. See the full blue potato bush care guide, its cold-hardiness guide, and watering schedule — humidity and watering problems are easy to confuse.