Plant care
Dragon's tonguetemperature & humidity
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More about dragon's tongue
Ideal temperature for dragon's tongue
Aim for 18-29°C (65-85°F) on the thermostat and you've handled the easy part. The hard part is the half-metre around the plant: window glass that drops to near-freezing on a January night, a radiator pumping out hot dry air, a draught from an opened front door. Move the plant 30 cm and you've usually fixed the problem. Below roughly 18°C the damage starts — soft blackened patches, translucent leaves, sometimes overnight.
Cold tolerance & winter care
Dragon's tongue is frost-tender (USDA 11-12 (outdoors only in frost-free tropical climates; a houseplant elsewhere), RHS H1b (warm; min 15°C, grow under glass or as a houseplant in the UK)). 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 dragon's tongue
Dragon's tongue sits happiest at around 50-85% relative humidity. High humidity is non-negotiable for good looks; below about 50% the leaf margins go crispy and brown within days. Aim for 60% or more using a pebble tray, a nearby humidifier, or grouping with other plants. It excels in enclosed terrariums and bottle gardens, where the warm, saturated air mimics its native tropical floor. 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.
Dragon's tongue temperature & humidity — frequently asked questions
What temperature is best for dragon's tongue?
Dragon's tongue grows best between 18-29°C (65-85°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 dragon's tongue tolerate?
Dragon's tongue 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 dragon's tongue need?
Dragon's tongue prefers about 50-85% relative humidity. High humidity is non-negotiable for good looks; below about 50% the leaf margins go crispy and brown within days. Aim for 60% or more using a pebble tray, a nearby humidifier, or grouping with other plants. It excels in enclosed terrariums and bottle gardens, where the warm, saturated air mimics its native tropical floor.
How do I raise humidity for dragon's tongue?
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 dragon's tongue live outside?
Dragon's tongue is rated for USDA zone 11-12 (outdoors only in frost-free tropical climates; a houseplant elsewhere) and RHS hardiness H1b (warm; min 15°C, grow under glass or as a houseplant in the UK). Outside that range it must come indoors before the first frost — treat any outdoor stint as a summer holiday, not a permanent home.
More dragon's tongue care
In the UK? Keeping dragon's tongue warm in a UK home covers the radiator, single-glazing and heating-season humidity angle. Temperature and humidity are one piece. See the full dragon's tongue care guide, its cold-hardiness guide, and watering schedule — humidity and watering problems are easy to confuse.