Plant care
Constricted Masdevalliatemperature & humidity
Masdevallia constricta
More about constricted masdevallia
Ideal temperature for constricted masdevallia
Aim for 10–23°C (day); nights 10–13°C (50–73°F (day); nights 50–55°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 10°C the damage starts — soft blackened patches, translucent leaves, sometimes overnight.
Cold tolerance & winter care
Constricted Masdevallia is frost-tender (USDA 11–12, RHS H1a). 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 constricted masdevallia
Constricted Masdevallia sits happiest at around 75–85% relative humidity. High humidity is critical, particularly in summer. Maintain 75–80% during warm months using a cool-mist humidifier. Ensure continuous air circulation with a fan to prevent fungal leaf spot, which is common when humidity is high and airflow is low. 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.
Constricted Masdevallia temperature & humidity — frequently asked questions
What temperature is best for constricted masdevallia?
Constricted Masdevallia grows best between 10–23°C (day); nights 10–13°C (50–73°F (day); nights 50–55°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 constricted masdevallia tolerate?
Constricted Masdevallia 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 constricted masdevallia need?
Constricted Masdevallia prefers about 75–85% relative humidity. High humidity is critical, particularly in summer. Maintain 75–80% during warm months using a cool-mist humidifier. Ensure continuous air circulation with a fan to prevent fungal leaf spot, which is common when humidity is high and airflow is low.
How do I raise humidity for constricted masdevallia?
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 constricted masdevallia live outside?
Constricted Masdevallia is rated for USDA zone 11–12 and RHS hardiness H1a. Outside that range it must come indoors before the first frost — treat any outdoor stint as a summer holiday, not a permanent home.
More constricted masdevallia care
In the UK? Keeping constricted masdevallia warm in a UK home covers the radiator, single-glazing and heating-season humidity angle. Temperature and humidity are one piece. See the full constricted masdevallia care guide, its cold-hardiness guide, and watering schedule — humidity and watering problems are easy to confuse.