Plant care
Painted Fern 'Burgundy Lace'temperature & humidity
Athyrium niponicum var. pictum 'Burgundy Lace'
More about painted fern 'burgundy lace'
Ideal temperature for painted fern 'burgundy lace'
Temperature kills fewer painted fern 'burgundy lace' plants than you'd think. What kills them is the micro-climate within a normal-temperature room — a leaf pressed against single-glazed winter glass, the hot dry updraft directly above a radiator, the cold blast from an AC vent. The thermostat reading at 13-22°C (55-72°F) is fine; the spot you put the plant in matters more. Below roughly 13°C growth pauses; cold beyond that pushes it into dormancy rather than killing it outright.
Cold tolerance & winter care
Painted Fern 'Burgundy Lace' is comparatively hardy (USDA 4-9 (fully hardy garden fern), RHS H7). Within that range it tolerates a cold dormant spell outdoors; outside it, grow it in a container you can move under cover or overwinter in a cool but frost-free spot. Hardiness assumes an established plant in well-drained soil — a wet, cold root zone kills far more plants than cold air alone.
Humidity for painted fern 'burgundy lace'
Painted Fern 'Burgundy Lace' sits happiest at around 50-70% relative humidity. Prefers moderate to high humidity; dry indoor air browns the fine frond edges. Outdoors in shaded, sheltered ground it seldom struggles. Indoors, cluster with other plants or use a humidifier, and keep it away from radiators and vents. 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.
Painted Fern 'Burgundy Lace' temperature & humidity — frequently asked questions
What temperature is best for painted fern 'burgundy lace'?
Painted Fern 'Burgundy Lace' grows best between 13-22°C (55-72°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 painted fern 'burgundy lace' tolerate?
Painted Fern 'Burgundy Lace' starts to suffer below roughly 13°C. It tolerates a cold dormant period within USDA 4-9 (fully hardy garden fern), but a wet cold root zone is more dangerous than cold air.
What humidity does painted fern 'burgundy lace' need?
Painted Fern 'Burgundy Lace' prefers about 50-70% relative humidity. Prefers moderate to high humidity; dry indoor air browns the fine frond edges. Outdoors in shaded, sheltered ground it seldom struggles. Indoors, cluster with other plants or use a humidifier, and keep it away from radiators and vents.
How do I raise humidity for painted fern 'burgundy lace'?
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 painted fern 'burgundy lace' live outside?
Painted Fern 'Burgundy Lace' is rated for USDA zone 4-9 (fully hardy garden fern) and RHS hardiness H7. Within that range it can stay outdoors; outside it, grow it in a moveable container and protect the roots from a wet, cold winter.
More painted fern 'burgundy lace' care
In the UK? Keeping painted fern 'burgundy lace' warm in a UK home covers the radiator, single-glazing and heating-season humidity angle. Temperature and humidity are one piece. See the full painted fern 'burgundy lace' care guide, its cold-hardiness guide, and watering schedule — humidity and watering problems are easy to confuse.