Plant care
Microsorum pteropus 'Trident'temperature & humidity
Microsorum pteropus 'Trident'
More about microsorum pteropus 'trident'
Ideal temperature for microsorum pteropus 'trident'
Aim for 20-28°C (68-82°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 20°C the damage starts — soft blackened patches, translucent leaves, sometimes overnight.
Cold tolerance & winter care
Microsorum pteropus 'Trident' is frost-tender (USDA Indoor aquarium plant (not frost hardy; keep above 18°C), 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 microsorum pteropus 'trident'
Microsorum pteropus 'Trident' sits happiest at around Submerged (100%) or 70-90% emersed relative humidity. Normally fully submerged. If transitioned to emersed growth in a terrarium or paludarium it needs very high humidity and frequent misting to stop the fronds crisping. 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.
Microsorum pteropus 'Trident' temperature & humidity — frequently asked questions
What temperature is best for microsorum pteropus 'trident'?
Microsorum pteropus 'Trident' grows best between 20-28°C (68-82°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 microsorum pteropus 'trident' tolerate?
Microsorum pteropus 'Trident' starts to suffer below roughly 20°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 microsorum pteropus 'trident' need?
Microsorum pteropus 'Trident' prefers about Submerged (100%) or 70-90% emersed relative humidity. Normally fully submerged. If transitioned to emersed growth in a terrarium or paludarium it needs very high humidity and frequent misting to stop the fronds crisping.
How do I raise humidity for microsorum pteropus 'trident'?
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 microsorum pteropus 'trident' live outside?
Microsorum pteropus 'Trident' is rated for USDA zone Indoor aquarium plant (not frost hardy; keep above 18°C) 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 microsorum pteropus 'trident' care
In the UK? Keeping microsorum pteropus 'trident' warm in a UK home covers the radiator, single-glazing and heating-season humidity angle. Temperature and humidity are one piece. See the full microsorum pteropus 'trident' care guide, its cold-hardiness guide, and watering schedule — humidity and watering problems are easy to confuse.