Plant care
Calamondin orangetemperature & humidity
Citrus × microcarpa
More about calamondin orange
Ideal temperature for calamondin orange
Temperature kills fewer calamondin orange 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 16-27°C (61-81°F) is fine; the spot you put the plant in matters more. Below roughly 16°C growth pauses; cold beyond that pushes it into dormancy rather than killing it outright.
Cold tolerance & winter care
Calamondin orange is comparatively hardy (USDA USDA zones 8b–11 (one of the hardiest citrus, but treat as frost-tender; protect below about 4°C / 40°F), RHS RHS H3 (hardy only in mild coastal or city areas; needs a frost-free conservatory or indoors over winter in most of the UK)). Within that range it tolerates a cold dormant spell outdoors; outside it, grow it in a container you can move under cover or overwinter in a cool but frost-free spot. Hardiness assumes an established plant in well-drained soil — a wet, cold root zone kills far more plants than cold air alone.
Humidity for calamondin orange
Calamondin orange sits happiest at around 50–60% relative humidity. Calamondin enjoys moderate to high humidity. In dry, heated rooms, mist the foliage or stand the pot on a tray of damp pebbles. Dry air, especially near radiators, encourages spider mites and can cause leaf and fruit drop. 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.
Calamondin orange temperature & humidity — frequently asked questions
What temperature is best for calamondin orange?
Calamondin orange grows best between 16-27°C (61-81°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 calamondin orange tolerate?
Calamondin orange starts to suffer below roughly 16°C. It tolerates a cold dormant period within USDA USDA zones 8b–11 (one of the hardiest citrus, but treat as frost-tender; protect below about 4°C / 40°F), but a wet cold root zone is more dangerous than cold air.
What humidity does calamondin orange need?
Calamondin orange prefers about 50–60% relative humidity. Calamondin enjoys moderate to high humidity. In dry, heated rooms, mist the foliage or stand the pot on a tray of damp pebbles. Dry air, especially near radiators, encourages spider mites and can cause leaf and fruit drop.
How do I raise humidity for calamondin orange?
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 calamondin orange live outside?
Calamondin orange is rated for USDA zone USDA zones 8b–11 (one of the hardiest citrus, but treat as frost-tender; protect below about 4°C / 40°F) and RHS hardiness RHS H3 (hardy only in mild coastal or city areas; needs a frost-free conservatory or indoors over winter in most of the UK). Within that range it can stay outdoors; outside it, grow it in a moveable container and protect the roots from a wet, cold winter.
More calamondin orange care
In the UK? Keeping calamondin orange warm in a UK home covers the radiator, single-glazing and heating-season humidity angle. Temperature and humidity are one piece. See the full calamondin orange care guide, its cold-hardiness guide, and watering schedule — humidity and watering problems are easy to confuse.