Plant care
Yellow Bladderworttemperature & humidity
Utricularia vulgaris
More about yellow bladderwort
Ideal temperature for yellow bladderwort
Aim for 15-28°C summer; cool dormancy near 0-10°C in winter (59-82°F summer; cool winter dormancy near 32-50°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 15°C growth pauses; cold beyond that pushes it into dormancy rather than killing it outright.
Cold tolerance & winter care
Yellow Bladderwort is comparatively hardy (USDA 4-9 (a hardy temperate species; overwinters as turions), RHS H5). Within that range it tolerates a cold dormant spell outdoors; outside it, grow it in a container you can move under cover or overwinter in a cool but frost-free spot. Hardiness assumes an established plant in well-drained soil — a wet, cold root zone kills far more plants than cold air alone.
Humidity for yellow bladderwort
Yellow Bladderwort sits happiest at around Not applicable (aquatic) relative humidity. Being submerged, ambient air humidity is irrelevant. The only moisture requirement is that the plant stays in clean, soft water at all times. 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.
Yellow Bladderwort temperature & humidity — frequently asked questions
What temperature is best for yellow bladderwort?
Yellow Bladderwort grows best between 15-28°C summer; cool dormancy near 0-10°C in winter (59-82°F summer; cool winter dormancy near 32-50°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 yellow bladderwort tolerate?
Yellow Bladderwort starts to suffer below roughly 15°C. It tolerates a cold dormant period within USDA 4-9 (a hardy temperate species; overwinters as turions), but a wet cold root zone is more dangerous than cold air.
What humidity does yellow bladderwort need?
Yellow Bladderwort prefers about Not applicable (aquatic) relative humidity. Being submerged, ambient air humidity is irrelevant. The only moisture requirement is that the plant stays in clean, soft water at all times.
How do I raise humidity for yellow 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 yellow bladderwort live outside?
Yellow Bladderwort is rated for USDA zone 4-9 (a hardy temperate species; overwinters as turions) and RHS hardiness H5. Within that range it can stay outdoors; outside it, grow it in a moveable container and protect the roots from a wet, cold winter.
More yellow bladderwort care
In the UK? Keeping yellow 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 yellow bladderwort care guide, its cold-hardiness guide, and watering schedule — humidity and watering problems are easy to confuse.