Plant care
Poinsettiatemperature & humidity
Euphorbia pulcherrima
More about poinsettia
Ideal temperature for poinsettia
Temperature kills fewer poinsettia 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 18-21C day, 13-18C night (65-70F day, 55-65F night) is fine; the spot you put the plant in matters more. Below roughly 18°C growth pauses; cold beyond that pushes it into dormancy rather than killing it outright.
Cold tolerance & winter care
Poinsettia is comparatively hardy (USDA 9-11 (grown as a tender houseplant elsewhere), RHS undefined). Within that range it tolerates a cold dormant spell outdoors; outside it, grow it in a container you can move under cover or overwinter in a cool but frost-free spot. Hardiness assumes an established plant in well-drained soil — a wet, cold root zone kills far more plants than cold air alone.
Humidity for poinsettia
Poinsettia sits happiest at around 40-60% relative humidity. Prefers moderate humidity. Dry, heated indoor air during winter accelerates leaf and bract drop and invites whitefly. Group with other plants or use a pebble tray to raise local humidity; avoid misting the bracts directly, which can encourage Botrytis. 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.
Poinsettia temperature & humidity — frequently asked questions
What temperature is best for poinsettia?
Poinsettia grows best between 18-21C day, 13-18C night (65-70F day, 55-65F 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 poinsettia tolerate?
Poinsettia starts to suffer below roughly 18°C. It tolerates a cold dormant period within USDA 9-11 (grown as a tender houseplant elsewhere), but a wet cold root zone is more dangerous than cold air.
What humidity does poinsettia need?
Poinsettia prefers about 40-60% relative humidity. Prefers moderate humidity. Dry, heated indoor air during winter accelerates leaf and bract drop and invites whitefly. Group with other plants or use a pebble tray to raise local humidity; avoid misting the bracts directly, which can encourage Botrytis.
How do I raise humidity for poinsettia?
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 poinsettia live outside?
Poinsettia is rated for USDA zone 9-11 (grown as a tender houseplant elsewhere). Within that range it can stay outdoors; outside it, grow it in a moveable container and protect the roots from a wet, cold winter.
More poinsettia care
In the UK? Keeping poinsettia warm in a UK home covers the radiator, single-glazing and heating-season humidity angle. Temperature and humidity are one piece. See the full poinsettia care guide, its cold-hardiness guide, and watering schedule — humidity and watering problems are easy to confuse.