Plant care
King Size Scarlet everlastingtemperature & humidity
Xerochrysum bracteatum 'King Size Scarlet'
More about king size scarlet everlasting
Ideal temperature for king size scarlet everlasting
Temperature kills fewer king size scarlet everlasting 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 10–32°C (50–90°F) is fine; the spot you put the plant in matters more. Below roughly 10°C the damage starts — soft blackened patches, translucent leaves, sometimes overnight.
Cold tolerance & winter care
King Size Scarlet everlasting is frost-tender (USDA 8-10, 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 king size scarlet everlasting
King Size Scarlet everlasting sits happiest at around 30–55% relative humidity. Performs best in low to moderate humidity. The papery bracts can trap moisture and rot in persistently damp conditions. Ensure good air movement between plants. 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.
King Size Scarlet everlasting temperature & humidity — frequently asked questions
What temperature is best for king size scarlet everlasting?
King Size Scarlet everlasting grows best between 10–32°C (50–90°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 king size scarlet everlasting tolerate?
King Size Scarlet everlasting 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 king size scarlet everlasting need?
King Size Scarlet everlasting prefers about 30–55% relative humidity. Performs best in low to moderate humidity. The papery bracts can trap moisture and rot in persistently damp conditions. Ensure good air movement between plants.
How do I raise humidity for king size scarlet everlasting?
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 king size scarlet everlasting live outside?
King Size Scarlet everlasting is rated for USDA zone 8-10 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 king size scarlet everlasting care
In the UK? Keeping king size scarlet everlasting warm in a UK home covers the radiator, single-glazing and heating-season humidity angle. Temperature and humidity are one piece. See the full king size scarlet everlasting care guide, its cold-hardiness guide, and watering schedule — humidity and watering problems are easy to confuse.