Plant care
Scarlet Martagon Lilytemperature & humidity
Lilium chalcedonicum
More about scarlet martagon lily
Ideal temperature for scarlet martagon lily
Temperature kills fewer scarlet martagon lily 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 -20°C to 32°C; optimal 15–25°C during growth (-4°F to 90°F; optimal 59–77°F during growth) is fine; the spot you put the plant in matters more. Below roughly -20°C growth pauses; cold beyond that pushes it into dormancy rather than killing it outright.
Cold tolerance & winter care
Scarlet Martagon Lily is comparatively hardy (USDA 4-8, RHS H6). 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 scarlet martagon lily
Scarlet Martagon Lily sits happiest at around Moderate — 40–60% relative humidity. Tolerates the typical outdoor humidity of temperate gardens. As a Mediterranean species, it is more heat- and drought-tolerant than northern European lily relatives, but it still benefits from good air circulation around the foliage to reduce the risk of Botrytis. 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.
Scarlet Martagon Lily temperature & humidity — frequently asked questions
What temperature is best for scarlet martagon lily?
Scarlet Martagon Lily grows best between -20°C to 32°C; optimal 15–25°C during growth (-4°F to 90°F; optimal 59–77°F during growth). 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 scarlet martagon lily tolerate?
Scarlet Martagon Lily starts to suffer below roughly -20°C. It tolerates a cold dormant period within USDA 4-8, but a wet cold root zone is more dangerous than cold air.
What humidity does scarlet martagon lily need?
Scarlet Martagon Lily prefers about Moderate — 40–60% relative humidity. Tolerates the typical outdoor humidity of temperate gardens. As a Mediterranean species, it is more heat- and drought-tolerant than northern European lily relatives, but it still benefits from good air circulation around the foliage to reduce the risk of Botrytis.
How do I raise humidity for scarlet martagon lily?
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 scarlet martagon lily live outside?
Scarlet Martagon Lily is rated for USDA zone 4-8 and RHS hardiness H6. 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 scarlet martagon lily care
In the UK? Keeping scarlet martagon lily warm in a UK home covers the radiator, single-glazing and heating-season humidity angle. Temperature and humidity are one piece. See the full scarlet martagon lily care guide, its cold-hardiness guide, and watering schedule — humidity and watering problems are easy to confuse.