Plant care
Nicotiana sylvestristemperature & humidity
Nicotiana sylvestris
More about nicotiana sylvestris
Ideal temperature for nicotiana sylvestris
Temperature kills fewer nicotiana sylvestris 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 15-27°C (59-81°F) is fine; the spot you put the plant in matters more. Below roughly 15°C growth pauses; cold beyond that pushes it into dormancy rather than killing it outright.
Cold tolerance & winter care
Nicotiana sylvestris is comparatively hardy (USDA 10-11 (grown as an annual or short-lived perennial; often self-seeds), RHS H3). 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 nicotiana sylvestris
Nicotiana sylvestris sits happiest at around 45-70% relative humidity. Prefers moderate to higher humidity and looks best where summers are not parched. In dry, exposed sites the large leaves scorch and wilt, so shelter and moisture help. 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.
Nicotiana sylvestris temperature & humidity — frequently asked questions
What temperature is best for nicotiana sylvestris?
Nicotiana sylvestris grows best between 15-27°C (59-81°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 nicotiana sylvestris tolerate?
Nicotiana sylvestris starts to suffer below roughly 15°C. It tolerates a cold dormant period within USDA 10-11 (grown as an annual or short-lived perennial; often self-seeds), but a wet cold root zone is more dangerous than cold air.
What humidity does nicotiana sylvestris need?
Nicotiana sylvestris prefers about 45-70% relative humidity. Prefers moderate to higher humidity and looks best where summers are not parched. In dry, exposed sites the large leaves scorch and wilt, so shelter and moisture help.
How do I raise humidity for nicotiana sylvestris?
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 nicotiana sylvestris live outside?
Nicotiana sylvestris is rated for USDA zone 10-11 (grown as an annual or short-lived perennial; often self-seeds) and RHS hardiness H3. 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 nicotiana sylvestris care
In the UK? Keeping nicotiana sylvestris warm in a UK home covers the radiator, single-glazing and heating-season humidity angle. Temperature and humidity are one piece. See the full nicotiana sylvestris care guide, its cold-hardiness guide, and watering schedule — humidity and watering problems are easy to confuse.