Plant care
Humboldt's Bladderworttemperature & humidity
Utricularia humboldtii
More about humboldt's bladderwort
Ideal temperature for humboldt's bladderwort
Humboldt's Bladderwort is comfortable in any room a person is comfortable in, roughly 10–25°C (50–77°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
Humboldt's Bladderwort is frost-tender (USDA 11-12, RHS H1a). 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 humboldt's bladderwort
Humboldt's Bladderwort sits happiest at around 70–95% relative humidity. Native to tepui summits in Venezuela where humidity is consistently very high and cloud cover is frequent. Requires humidity above 70% to prevent desiccation of exposed foliage. A sealed or semi-sealed terrarium with ventilation is highly recommended for indoor cultivation. 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.
Humboldt's Bladderwort temperature & humidity — frequently asked questions
What temperature is best for humboldt's bladderwort?
Humboldt's Bladderwort grows best between 10–25°C (50–77°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 humboldt's bladderwort tolerate?
Humboldt's Bladderwort 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 humboldt's bladderwort need?
Humboldt's Bladderwort prefers about 70–95% relative humidity. Native to tepui summits in Venezuela where humidity is consistently very high and cloud cover is frequent. Requires humidity above 70% to prevent desiccation of exposed foliage. A sealed or semi-sealed terrarium with ventilation is highly recommended for indoor cultivation.
How do I raise humidity for humboldt's bladderwort?
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 humboldt's bladderwort live outside?
Humboldt's Bladderwort is rated for USDA zone 11-12 and RHS hardiness H1a. Outside that range it must come indoors before the first frost — treat any outdoor stint as a summer holiday, not a permanent home.
More humboldt's bladderwort care
In the UK? Keeping humboldt's bladderwort warm in a UK home covers the radiator, single-glazing and heating-season humidity angle. Temperature and humidity are one piece. See the full humboldt's bladderwort care guide, its cold-hardiness guide, and watering schedule — humidity and watering problems are easy to confuse.