Plant care
Polynesian Davalliatemperature & humidity
Davallia solida
More about polynesian davallia
Ideal temperature for polynesian davallia
Temperature kills fewer polynesian davallia 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 15–28 °C (59–82 °F) is fine; the spot you put the plant in matters more. Below roughly 15°C the damage starts — soft blackened patches, translucent leaves, sometimes overnight.
Cold tolerance & winter care
Polynesian Davallia is frost-tender (USDA 10–12, RHS H1b). 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 polynesian davallia
Polynesian Davallia sits happiest at around 45–65% relative humidity. More tolerant of average indoor humidity than most ferns, making it a better choice for typical home conditions. Humidity above 45% keeps fronds healthy. Avoid prolonged exposure below 40% — use a pebble tray or humidifier in winter when heating is running. Rhizomes should not be misted directly. 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.
Polynesian Davallia temperature & humidity — frequently asked questions
What temperature is best for polynesian davallia?
Polynesian Davallia grows best between 15–28 °C (59–82 °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 polynesian davallia tolerate?
Polynesian Davallia starts to suffer below roughly 15°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 polynesian davallia need?
Polynesian Davallia prefers about 45–65% relative humidity. More tolerant of average indoor humidity than most ferns, making it a better choice for typical home conditions. Humidity above 45% keeps fronds healthy. Avoid prolonged exposure below 40% — use a pebble tray or humidifier in winter when heating is running. Rhizomes should not be misted directly.
How do I raise humidity for polynesian davallia?
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 polynesian davallia live outside?
Polynesian Davallia is rated for USDA zone 10–12 and RHS hardiness H1b. Outside that range it must come indoors before the first frost — treat any outdoor stint as a summer holiday, not a permanent home.
More polynesian davallia care
In the UK? Keeping polynesian davallia warm in a UK home covers the radiator, single-glazing and heating-season humidity angle. Temperature and humidity are one piece. See the full polynesian davallia care guide, its cold-hardiness guide, and watering schedule — humidity and watering problems are easy to confuse.