Plant care
Narrow-leaf Zamiatemperature & humidity
Zamia angustifolia
More about narrow-leaf zamia
Ideal temperature for narrow-leaf zamia
Aim for 13–35°C (55–95°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 13°C the damage starts — soft blackened patches, translucent leaves, sometimes overnight.
Cold tolerance & winter care
Narrow-leaf Zamia is frost-tender (USDA 9b–11, 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 narrow-leaf zamia
Narrow-leaf Zamia sits happiest at around 40–70% relative humidity. Naturally adapted to coastal and subtropical humid conditions. Tolerates moderate to higher humidity. Standard indoor humidity is generally sufficient. Good air circulation helps prevent fungal issues, especially in humid climates. 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.
Narrow-leaf Zamia temperature & humidity — frequently asked questions
What temperature is best for narrow-leaf zamia?
Narrow-leaf Zamia grows best between 13–35°C (55–95°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 narrow-leaf zamia tolerate?
Narrow-leaf Zamia starts to suffer below roughly 13°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 narrow-leaf zamia need?
Narrow-leaf Zamia prefers about 40–70% relative humidity. Naturally adapted to coastal and subtropical humid conditions. Tolerates moderate to higher humidity. Standard indoor humidity is generally sufficient. Good air circulation helps prevent fungal issues, especially in humid climates.
How do I raise humidity for narrow-leaf zamia?
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 narrow-leaf zamia live outside?
Narrow-leaf Zamia is rated for USDA zone 9b–11 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 narrow-leaf zamia care
In the UK? Keeping narrow-leaf zamia warm in a UK home covers the radiator, single-glazing and heating-season humidity angle. Temperature and humidity are one piece. See the full narrow-leaf zamia care guide, its cold-hardiness guide, and watering schedule — humidity and watering problems are easy to confuse.