Plant care
Webb's Wonderful Lettucetemperature & humidity
Lactuca sativa
More about webb's wonderful lettuce
Ideal temperature for webb's wonderful lettuce
Webb's Wonderful Lettuce is comfortable in any room a person is comfortable in, roughly 7-21°C (45-70°F). The mistakes are micro-climates: a north-facing window on a frosty night, a south-facing windowsill in a summer heatwave, the standing draught between an opened kitchen door and the radiator behind it. Read the room around the plant, not the thermostat. Below roughly 7°C growth pauses; cold beyond that pushes it into dormancy rather than killing it outright.
Cold tolerance & winter care
Webb's Wonderful Lettuce is comparatively hardy (USDA 2-11 (cool-season annual), RHS H5 (seedlings hardy to light frost with protection)). 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 webb's wonderful lettuce
Webb's Wonderful Lettuce sits happiest at around 50-70% relative humidity. Lettuce performs best in cooler, moderately humid conditions. High humidity combined with warmth promotes tip burn and botrytis; ensure good air circulation. 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.
Webb's Wonderful Lettuce temperature & humidity — frequently asked questions
What temperature is best for webb's wonderful lettuce?
Webb's Wonderful Lettuce grows best between 7-21°C (45-70°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 webb's wonderful lettuce tolerate?
Webb's Wonderful Lettuce starts to suffer below roughly 7°C. It tolerates a cold dormant period within USDA 2-11 (cool-season annual), but a wet cold root zone is more dangerous than cold air.
What humidity does webb's wonderful lettuce need?
Webb's Wonderful Lettuce prefers about 50-70% relative humidity. Lettuce performs best in cooler, moderately humid conditions. High humidity combined with warmth promotes tip burn and botrytis; ensure good air circulation.
How do I raise humidity for webb's wonderful lettuce?
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 webb's wonderful lettuce live outside?
Webb's Wonderful Lettuce is rated for USDA zone 2-11 (cool-season annual) and RHS hardiness H5 (seedlings hardy to light frost with protection). 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 webb's wonderful lettuce care
In the UK? Keeping webb's wonderful lettuce warm in a UK home covers the radiator, single-glazing and heating-season humidity angle. Temperature and humidity are one piece. See the full webb's wonderful lettuce care guide, its cold-hardiness guide, and watering schedule — humidity and watering problems are easy to confuse.