Plant care
Calathea 'Flamestar'temperature & humidity
Goeppertia veitchiana 'Flamestar'
More about calathea 'flamestar'
Ideal temperature for calathea 'flamestar'
Calathea 'Flamestar' is comfortable in any room a person is comfortable in, roughly 18-27 C (ideal 18-24 C); avoid below 15 C (64-81 F (ideal 64-75 F); avoid below 59 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 18°C the damage starts — soft blackened patches, translucent leaves, sometimes overnight.
Cold tolerance & winter care
Calathea 'Flamestar' is frost-tender (USDA USDA zones 11-12 outdoors; grown as a houseplant elsewhere, RHS undefined). 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 calathea 'flamestar'
Calathea 'Flamestar' sits happiest at around Above 50-60%, ideally 60%+ relative humidity. High humidity is the make-or-break factor. In dry household air the wavy leaf edges turn brown and brittle. Raise humidity with a humidifier, a pebble-and-water tray or by grouping with other plants. Misting helps temporarily but a humidifier is far more reliable. 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.
Calathea 'Flamestar' temperature & humidity — frequently asked questions
What temperature is best for calathea 'flamestar'?
Calathea 'Flamestar' grows best between 18-27 C (ideal 18-24 C); avoid below 15 C (64-81 F (ideal 64-75 F); avoid below 59 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 calathea 'flamestar' tolerate?
Calathea 'Flamestar' 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 calathea 'flamestar' need?
Calathea 'Flamestar' prefers about Above 50-60%, ideally 60%+ relative humidity. High humidity is the make-or-break factor. In dry household air the wavy leaf edges turn brown and brittle. Raise humidity with a humidifier, a pebble-and-water tray or by grouping with other plants. Misting helps temporarily but a humidifier is far more reliable.
How do I raise humidity for calathea 'flamestar'?
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 calathea 'flamestar' live outside?
Calathea 'Flamestar' is rated for USDA zone USDA zones 11-12 outdoors; grown as a houseplant elsewhere. Outside that range it must come indoors before the first frost — treat any outdoor stint as a summer holiday, not a permanent home.
More calathea 'flamestar' care
In the UK? Keeping calathea 'flamestar' warm in a UK home covers the radiator, single-glazing and heating-season humidity angle. Temperature and humidity are one piece. See the full calathea 'flamestar' care guide, its cold-hardiness guide, and watering schedule — humidity and watering problems are easy to confuse.