Plant care
Hooded-leaf Pelargoniumtemperature & humidity
Pelargonium cucullatum
More about hooded-leaf pelargonium
Ideal temperature for hooded-leaf pelargonium
Aim for 8–26°C (46–79°F) on the thermostat and you've handled the easy part. The hard part is the half-metre around the plant: window glass that drops to near-freezing on a January night, a radiator pumping out hot dry air, a draught from an opened front door. Move the plant 30 cm and you've usually fixed the problem. Below roughly 8°C the damage starts — soft blackened patches, translucent leaves, sometimes overnight.
Cold tolerance & winter care
Hooded-leaf Pelargonium is frost-tender (USDA 9-11 (overwinter frost-free elsewhere), RHS H2). 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 hooded-leaf pelargonium
Hooded-leaf Pelargonium sits happiest at around 35–55% relative humidity. Prefers dry, well-ventilated conditions typical of its Mediterranean-climate origins. High humidity promotes botrytis and pelargonium rust; space plants for airflow and avoid misting. 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.
Hooded-leaf Pelargonium temperature & humidity — frequently asked questions
What temperature is best for hooded-leaf pelargonium?
Hooded-leaf Pelargonium grows best between 8–26°C (46–79°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 hooded-leaf pelargonium tolerate?
Hooded-leaf Pelargonium starts to suffer below roughly 8°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 hooded-leaf pelargonium need?
Hooded-leaf Pelargonium prefers about 35–55% relative humidity. Prefers dry, well-ventilated conditions typical of its Mediterranean-climate origins. High humidity promotes botrytis and pelargonium rust; space plants for airflow and avoid misting.
How do I raise humidity for hooded-leaf pelargonium?
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 hooded-leaf pelargonium live outside?
Hooded-leaf Pelargonium is rated for USDA zone 9-11 (overwinter frost-free elsewhere) and RHS hardiness H2. Outside that range it must come indoors before the first frost — treat any outdoor stint as a summer holiday, not a permanent home.
More hooded-leaf pelargonium care
In the UK? Keeping hooded-leaf pelargonium warm in a UK home covers the radiator, single-glazing and heating-season humidity angle. Temperature and humidity are one piece. See the full hooded-leaf pelargonium care guide, its cold-hardiness guide, and watering schedule — humidity and watering problems are easy to confuse.