Plant care
Spencer Waved sweet peatemperature & humidity
Lathyrus odoratus 'Spencer Waved'
More about spencer waved sweet pea
Ideal temperature for spencer waved sweet pea
Aim for 7–21°C (45–70°F) on the thermostat and you've handled the easy part. The hard part is the half-metre around the plant: window glass that drops to near-freezing on a January night, a radiator pumping out hot dry air, a draught from an opened front door. Move the plant 30 cm and you've usually fixed the problem. Below roughly 7°C growth pauses; cold beyond that pushes it into dormancy rather than killing it outright.
Cold tolerance & winter care
Spencer Waved sweet pea is comparatively hardy (USDA 2–11 (cool-season annual), 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 spencer waved sweet pea
Spencer Waved sweet pea sits happiest at around 50–70% relative humidity. Benefits from moderate atmospheric humidity. In hot, dry conditions blooms fade and shatter quickly. Watering the soil (not leaves) keeps the root zone cool and maintains adequate ambient humidity around the foliage. 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.
Spencer Waved sweet pea temperature & humidity — frequently asked questions
What temperature is best for spencer waved sweet pea?
Spencer Waved sweet pea 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 spencer waved sweet pea tolerate?
Spencer Waved sweet 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 spencer waved sweet pea need?
Spencer Waved sweet pea prefers about 50–70% relative humidity. Benefits from moderate atmospheric humidity. In hot, dry conditions blooms fade and shatter quickly. Watering the soil (not leaves) keeps the root zone cool and maintains adequate ambient humidity around the foliage.
How do I raise humidity for spencer waved sweet 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 spencer waved sweet pea live outside?
Spencer Waved sweet pea is rated for USDA zone 2–11 (cool-season annual) 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 spencer waved sweet pea care
In the UK? Keeping spencer waved sweet 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 spencer waved sweet pea care guide, its cold-hardiness guide, and watering schedule — humidity and watering problems are easy to confuse.