Plant care
Lady Slipper Orchidtemperature & humidity
Paphiopedilum spp.
More about lady slipper orchid
Ideal temperature for lady slipper orchid
Aim for 10-25C (50-77F) 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 10°C the damage starts — soft blackened patches, translucent leaves, sometimes overnight.
Cold tolerance & winter care
Lady Slipper Orchid is frost-tender (USDA Indoor/glasshouse only in temperate climates; outdoors roughly USDA zones 10-12. Keep above 10-13C (50-55F) for green-leaved types and above ~18C (65F) at night for mottled-leaved types., RHS undefined). 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 lady slipper orchid
Lady Slipper Orchid sits happiest at around 40-60% relative humidity. Prefers moderate to high humidity of around 40-60%. Do not mist, as water sitting in the crown causes rot; instead stand the pot on a tray of damp pebbles and ensure gentle air movement, especially when humidity is high. 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.
Lady Slipper Orchid temperature & humidity — frequently asked questions
What temperature is best for lady slipper orchid?
Lady Slipper Orchid grows best between 10-25C (50-77F). 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 lady slipper orchid tolerate?
Lady Slipper Orchid starts to suffer below roughly 10°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 lady slipper orchid need?
Lady Slipper Orchid prefers about 40-60% relative humidity. Prefers moderate to high humidity of around 40-60%. Do not mist, as water sitting in the crown causes rot; instead stand the pot on a tray of damp pebbles and ensure gentle air movement, especially when humidity is high.
How do I raise humidity for lady slipper orchid?
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 lady slipper orchid live outside?
Lady Slipper Orchid is rated for USDA zone Indoor/glasshouse only in temperate climates; outdoors roughly USDA zones 10-12. Keep above 10-13C (50-55F) for green-leaved types and above ~18C (65F) at night for mottled-leaved types.. Outside that range it must come indoors before the first frost — treat any outdoor stint as a summer holiday, not a permanent home.
More lady slipper orchid care
In the UK? Keeping lady slipper orchid warm in a UK home covers the radiator, single-glazing and heating-season humidity angle. Temperature and humidity are one piece. See the full lady slipper orchid care guide, its cold-hardiness guide, and watering schedule — humidity and watering problems are easy to confuse.