Plant care
Round-lobed Hepaticatemperature & humidity
Hepatica americana
More about round-lobed hepatica
Ideal temperature for round-lobed hepatica
Temperature kills fewer round-lobed hepatica 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 -30 to 22°C (-22 to 72°F) is fine; the spot you put the plant in matters more. Below roughly -30°C growth pauses; cold beyond that pushes it into dormancy rather than killing it outright.
Cold tolerance & winter care
Round-lobed Hepatica is comparatively hardy (USDA 3–8, RHS H7). 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 round-lobed hepatica
Round-lobed Hepatica sits happiest at around 45–70% relative humidity. Adapted to the humid understorey of eastern North American woodlands. No supplemental misting is needed outdoors. Ensure good airflow at crown level to minimise fungal problems. 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.
Round-lobed Hepatica temperature & humidity — frequently asked questions
What temperature is best for round-lobed hepatica?
Round-lobed Hepatica grows best between -30 to 22°C (-22 to 72°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 round-lobed hepatica tolerate?
Round-lobed Hepatica starts to suffer below roughly -30°C. It tolerates a cold dormant period within USDA 3–8, but a wet cold root zone is more dangerous than cold air.
What humidity does round-lobed hepatica need?
Round-lobed Hepatica prefers about 45–70% relative humidity. Adapted to the humid understorey of eastern North American woodlands. No supplemental misting is needed outdoors. Ensure good airflow at crown level to minimise fungal problems.
How do I raise humidity for round-lobed hepatica?
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 round-lobed hepatica live outside?
Round-lobed Hepatica is rated for USDA zone 3–8 and RHS hardiness H7. 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 round-lobed hepatica care
In the UK? Keeping round-lobed hepatica warm in a UK home covers the radiator, single-glazing and heating-season humidity angle. Temperature and humidity are one piece. See the full round-lobed hepatica care guide, its cold-hardiness guide, and watering schedule — humidity and watering problems are easy to confuse.