Plant care
Super King Ixoratemperature & humidity
Ixora coccinea 'Super King'
More about super king ixora
Ideal temperature for super king ixora
Super King Ixora is comfortable in any room a person is comfortable in, roughly 18-38°C (64-100°F). The mistakes are micro-climates: a north-facing window on a frosty night, a south-facing windowsill in a summer heatwave, the standing draught between an opened kitchen door and the radiator behind it. Read the room around the plant, not the thermostat. Below roughly 18°C the damage starts — soft blackened patches, translucent leaves, sometimes overnight.
Cold tolerance & winter care
Super King Ixora is frost-tender (USDA 10-12, RHS H1a). 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 super king ixora
Super King Ixora sits happiest at around 60-85% relative humidity. Thrives in high tropical humidity. In drier conditions, frequent misting of foliage (avoid wetting open flower clusters, which may rot) and pebble trays with water help maintain adequate moisture in the air around the plant. 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.
Super King Ixora temperature & humidity — frequently asked questions
What temperature is best for super king ixora?
Super King Ixora grows best between 18-38°C (64-100°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 super king ixora tolerate?
Super King Ixora 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 super king ixora need?
Super King Ixora prefers about 60-85% relative humidity. Thrives in high tropical humidity. In drier conditions, frequent misting of foliage (avoid wetting open flower clusters, which may rot) and pebble trays with water help maintain adequate moisture in the air around the plant.
How do I raise humidity for super king ixora?
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 super king ixora live outside?
Super King Ixora is rated for USDA zone 10-12 and RHS hardiness H1a. Outside that range it must come indoors before the first frost — treat any outdoor stint as a summer holiday, not a permanent home.
More super king ixora care
In the UK? Keeping super king ixora warm in a UK home covers the radiator, single-glazing and heating-season humidity angle. Temperature and humidity are one piece. See the full super king ixora care guide, its cold-hardiness guide, and watering schedule — humidity and watering problems are easy to confuse.