Plant care
Richard's Thymetemperature & humidity
Thymus richardii
More about richard's thyme
Ideal temperature for richard's thyme
Temperature kills fewer richard's thyme 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 to 35°C (14 to 95°F) is fine; the spot you put the plant in matters more. Below roughly -10°C growth pauses; cold beyond that pushes it into dormancy rather than killing it outright.
Cold tolerance & winter care
Richard's Thyme is comparatively hardy (USDA 7-9, RHS H4). 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 richard's thyme
Richard's Thyme sits happiest at around Low (30-50%) relative humidity. Adapted to dry, coastal Mediterranean environments; in higher-rainfall UK climates, site in an open, well-ventilated position to prevent moisture build-up in the mat-forming foliage. 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.
Richard's Thyme temperature & humidity — frequently asked questions
What temperature is best for richard's thyme?
Richard's Thyme grows best between -10 to 35°C (14 to 95°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 richard's thyme tolerate?
Richard's Thyme starts to suffer below roughly -10°C. It tolerates a cold dormant period within USDA 7-9, but a wet cold root zone is more dangerous than cold air.
What humidity does richard's thyme need?
Richard's Thyme prefers about Low (30-50%) relative humidity. Adapted to dry, coastal Mediterranean environments; in higher-rainfall UK climates, site in an open, well-ventilated position to prevent moisture build-up in the mat-forming foliage.
How do I raise humidity for richard's thyme?
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 richard's thyme live outside?
Richard's Thyme is rated for USDA zone 7-9 and RHS hardiness H4. 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 richard's thyme care
In the UK? Keeping richard's thyme warm in a UK home covers the radiator, single-glazing and heating-season humidity angle. Temperature and humidity are one piece. See the full richard's thyme care guide, its cold-hardiness guide, and watering schedule — humidity and watering problems are easy to confuse.