Plant care
Round-Leaf Calatheatemperature & humidity
Calathea orbifolia
More about round-leaf calathea
Ideal temperature for round-leaf calathea
Temperature kills fewer round-leaf calathea 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 (65–75°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
Round-Leaf Calathea 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 round-leaf calathea
Round-Leaf Calathea sits happiest at around 60–80% relative humidity. Demands higher humidity than most houseplants. Brown, crispy leaf edges are the first sign humidity is too low. A room humidifier placed nearby is most effective; pebble trays and plant grouping offer supplementary help. Avoid misting directly on the large leaf surfaces. 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-Leaf Calathea temperature & humidity — frequently asked questions
What temperature is best for round-leaf calathea?
Round-Leaf Calathea grows best between 18–24°C (65–75°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 round-leaf calathea tolerate?
Round-Leaf Calathea 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 round-leaf calathea need?
Round-Leaf Calathea prefers about 60–80% relative humidity. Demands higher humidity than most houseplants. Brown, crispy leaf edges are the first sign humidity is too low. A room humidifier placed nearby is most effective; pebble trays and plant grouping offer supplementary help. Avoid misting directly on the large leaf surfaces.
How do I raise humidity for round-leaf calathea?
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-leaf calathea live outside?
Round-Leaf Calathea 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 round-leaf calathea care
In the UK? Keeping round-leaf calathea 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-leaf calathea care guide, its cold-hardiness guide, and watering schedule — humidity and watering problems are easy to confuse.