Plant care
Ipomoea nil 'Scarlett O'Hara'temperature & humidity
Ipomoea nil 'Scarlett O'Hara'
More about ipomoea nil 'scarlett o'hara'
Ideal temperature for ipomoea nil 'scarlett o'hara'
Aim for 18 to 30°C (64 to 86°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 18°C the damage starts — soft blackened patches, translucent leaves, sometimes overnight.
Cold tolerance & winter care
Ipomoea nil 'Scarlett O'Hara' is frost-tender (USDA 2-11 (frost-tender warm-season annual), 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 ipomoea nil 'scarlett o'hara'
Ipomoea nil 'Scarlett O'Hara' sits happiest at around 40-70% relative humidity. A warm-season annual indifferent to humidity. Normal summer air is fine; no special humidity care required. 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.
Ipomoea nil 'Scarlett O'Hara' temperature & humidity — frequently asked questions
What temperature is best for ipomoea nil 'scarlett o'hara'?
Ipomoea nil 'Scarlett O'Hara' grows best between 18 to 30°C (64 to 86°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 ipomoea nil 'scarlett o'hara' tolerate?
Ipomoea nil 'Scarlett O'Hara' 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 ipomoea nil 'scarlett o'hara' need?
Ipomoea nil 'Scarlett O'Hara' prefers about 40-70% relative humidity. A warm-season annual indifferent to humidity. Normal summer air is fine; no special humidity care required.
How do I raise humidity for ipomoea nil 'scarlett o'hara'?
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 ipomoea nil 'scarlett o'hara' live outside?
Ipomoea nil 'Scarlett O'Hara' is rated for USDA zone 2-11 (frost-tender warm-season annual) 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 ipomoea nil 'scarlett o'hara' care
In the UK? Keeping ipomoea nil 'scarlett o'hara' warm in a UK home covers the radiator, single-glazing and heating-season humidity angle. Temperature and humidity are one piece. See the full ipomoea nil 'scarlett o'hara' care guide, its cold-hardiness guide, and watering schedule — humidity and watering problems are easy to confuse.