Plant care
Snow Peatemperature & humidity
Pisum sativum var. macrocarpon
More about snow pea
Ideal temperature for snow pea
Snow Pea is comfortable in any room a person is comfortable in, roughly 7–18°C (optimum); tolerates light frost to −2°C (45–65°F (optimum); tolerates light frost to 28°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
Snow Pea is comparatively hardy (USDA 2–11 (cool-season annual), RHS H4). 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 snow pea
Snow Pea sits happiest at around 40–70% relative humidity. Moderate ambient humidity is fine. High humidity combined with poor air circulation promotes powdery mildew; space plants 5–8 cm apart and trellis upright to maximise airflow. 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.
Snow Pea temperature & humidity — frequently asked questions
What temperature is best for snow pea?
Snow Pea grows best between 7–18°C (optimum); tolerates light frost to −2°C (45–65°F (optimum); tolerates light frost to 28°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 snow pea tolerate?
Snow Pea 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 snow pea need?
Snow Pea prefers about 40–70% relative humidity. Moderate ambient humidity is fine. High humidity combined with poor air circulation promotes powdery mildew; space plants 5–8 cm apart and trellis upright to maximise airflow.
How do I raise humidity for snow pea?
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 snow pea live outside?
Snow Pea is rated for USDA zone 2–11 (cool-season annual) and RHS hardiness H4. 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 snow pea care
In the UK? Keeping snow pea warm in a UK home covers the radiator, single-glazing and heating-season humidity angle. Temperature and humidity are one piece. See the full snow pea care guide, its cold-hardiness guide, and watering schedule — humidity and watering problems are easy to confuse.