Plant care
Red Frangipanitemperature & humidity
Plumeria rubra
More about red frangipani
Ideal temperature for red frangipani
Red Frangipani is comfortable in any room a person is comfortable in, roughly 18–32°C (65–90°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
Red Frangipani 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 red frangipani
Red Frangipani sits happiest at around 40–70% relative humidity. Tolerates a range of humidity levels and adapts well to normal household air. In very dry indoor environments during winter dormancy, low humidity is not a concern as the plant has lost its leaves. High humidity combined with cool temperatures and wet soil promotes fungal stem rot. 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.
Red Frangipani temperature & humidity — frequently asked questions
What temperature is best for red frangipani?
Red Frangipani grows best between 18–32°C (65–90°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 red frangipani tolerate?
Red Frangipani 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 red frangipani need?
Red Frangipani prefers about 40–70% relative humidity. Tolerates a range of humidity levels and adapts well to normal household air. In very dry indoor environments during winter dormancy, low humidity is not a concern as the plant has lost its leaves. High humidity combined with cool temperatures and wet soil promotes fungal stem rot.
How do I raise humidity for red frangipani?
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 red frangipani live outside?
Red Frangipani 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 red frangipani care
In the UK? Keeping red frangipani warm in a UK home covers the radiator, single-glazing and heating-season humidity angle. Temperature and humidity are one piece. See the full red frangipani care guide, its cold-hardiness guide, and watering schedule — humidity and watering problems are easy to confuse.