Plant care
Triangle palmtemperature & humidity
Dypsis decaryi
More about triangle palm
Ideal temperature for triangle palm
Temperature kills fewer triangle palm 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 21-32°C (min ~13°C at night) (70-90°F (min ~55°F at night)) is fine; the spot you put the plant in matters more. Below roughly 21°C the damage starts — soft blackened patches, translucent leaves, sometimes overnight.
Cold tolerance & winter care
Triangle palm is frost-tender (USDA 10-11 (marginal in 9b; indoor-only in most US/UK homes), 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 triangle palm
Triangle palm sits happiest at around 40-60% relative humidity. More forgiving of dry air than many palms, but humidity at the lower end of average rooms can brown frond tips and invites spider mites. A pebble tray or grouping with other plants helps in heated winter rooms. 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.
Triangle palm temperature & humidity — frequently asked questions
What temperature is best for triangle palm?
Triangle palm grows best between 21-32°C (min ~13°C at night) (70-90°F (min ~55°F at night)). 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 triangle palm tolerate?
Triangle palm starts to suffer below roughly 21°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 triangle palm need?
Triangle palm prefers about 40-60% relative humidity. More forgiving of dry air than many palms, but humidity at the lower end of average rooms can brown frond tips and invites spider mites. A pebble tray or grouping with other plants helps in heated winter rooms.
How do I raise humidity for triangle palm?
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 triangle palm live outside?
Triangle palm is rated for USDA zone 10-11 (marginal in 9b; indoor-only in most US/UK homes). Outside that range it must come indoors before the first frost — treat any outdoor stint as a summer holiday, not a permanent home.
More triangle palm care
In the UK? Keeping triangle palm warm in a UK home covers the radiator, single-glazing and heating-season humidity angle. Temperature and humidity are one piece. See the full triangle palm care guide, its cold-hardiness guide, and watering schedule — humidity and watering problems are easy to confuse.