Plant care
Pelargonium 'Flower of Spring'temperature & humidity
Pelargonium 'Flower of Spring'
More about pelargonium 'flower of spring'
Ideal temperature for pelargonium 'flower of spring'
Aim for 10-24°C (50-75°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 10°C the damage starts — soft blackened patches, translucent leaves, sometimes overnight.
Cold tolerance & winter care
Pelargonium 'Flower of Spring' is frost-tender (USDA 9-11 (tender; protect from frost), RHS H1c). 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 pelargonium 'flower of spring'
Pelargonium 'Flower of Spring' sits happiest at around 30-50% relative humidity. Average, drier room air is ideal. Avoid still, humid conditions that encourage botrytis and rust; do not mist. 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.
Pelargonium 'Flower of Spring' temperature & humidity — frequently asked questions
What temperature is best for pelargonium 'flower of spring'?
Pelargonium 'Flower of Spring' grows best between 10-24°C (50-75°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 pelargonium 'flower of spring' tolerate?
Pelargonium 'Flower of Spring' starts to suffer below roughly 10°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 pelargonium 'flower of spring' need?
Pelargonium 'Flower of Spring' prefers about 30-50% relative humidity. Average, drier room air is ideal. Avoid still, humid conditions that encourage botrytis and rust; do not mist.
How do I raise humidity for pelargonium 'flower of spring'?
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 pelargonium 'flower of spring' live outside?
Pelargonium 'Flower of Spring' is rated for USDA zone 9-11 (tender; protect from frost) and RHS hardiness H1c. Outside that range it must come indoors before the first frost — treat any outdoor stint as a summer holiday, not a permanent home.
More pelargonium 'flower of spring' care
In the UK? Keeping pelargonium 'flower of spring' warm in a UK home covers the radiator, single-glazing and heating-season humidity angle. Temperature and humidity are one piece. See the full pelargonium 'flower of spring' care guide, its cold-hardiness guide, and watering schedule — humidity and watering problems are easy to confuse.