Plant care
Mexican Tarragontemperature & humidity
Tagetes lucida
More about mexican tarragon
Ideal temperature for mexican tarragon
Mexican Tarragon is comfortable in any room a person is comfortable in, roughly 18-30°C (65-86°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
Mexican Tarragon is frost-tender (USDA 8-11 (perennial in zones 9-11; grown as annual or lifted in colder zones), 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 mexican tarragon
Mexican Tarragon sits happiest at around 30-60% relative humidity. Tolerates both dry air and the warm humidity of subtropical summers far better than French tarragon, which is one of its key advantages as a substitute in hot, muggy regions. 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.
Mexican Tarragon temperature & humidity — frequently asked questions
What temperature is best for mexican tarragon?
Mexican Tarragon grows best between 18-30°C (65-86°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 mexican tarragon tolerate?
Mexican Tarragon 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 mexican tarragon need?
Mexican Tarragon prefers about 30-60% relative humidity. Tolerates both dry air and the warm humidity of subtropical summers far better than French tarragon, which is one of its key advantages as a substitute in hot, muggy regions.
How do I raise humidity for mexican tarragon?
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 mexican tarragon live outside?
Mexican Tarragon is rated for USDA zone 8-11 (perennial in zones 9-11; grown as annual or lifted in colder zones) 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 mexican tarragon care
In the UK? Keeping mexican tarragon warm in a UK home covers the radiator, single-glazing and heating-season humidity angle. Temperature and humidity are one piece. See the full mexican tarragon care guide, its cold-hardiness guide, and watering schedule — humidity and watering problems are easy to confuse.