Plant care
Cranberry 'Stevens'temperature & humidity
Vaccinium macrocarpon 'Stevens'
More about cranberry 'stevens'
Ideal temperature for cranberry 'stevens'
Temperature kills fewer cranberry 'stevens' 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 -30 to 28°C (-22 to 82°F) is fine; the spot you put the plant in matters more. Below roughly -30°C growth pauses; cold beyond that pushes it into dormancy rather than killing it outright.
Cold tolerance & winter care
Cranberry 'Stevens' is comparatively hardy (USDA 2-7, RHS H7). 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 cranberry 'stevens'
Cranberry 'Stevens' sits happiest at around Ambient outdoor, prefers moist air relative humidity. A wetland cultivar at home in cool, damp, humid conditions; grown outdoors in saturated ground, so no special indoor humidity provision is required. 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.
Cranberry 'Stevens' temperature & humidity — frequently asked questions
What temperature is best for cranberry 'stevens'?
Cranberry 'Stevens' grows best between -30 to 28°C (-22 to 82°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 cranberry 'stevens' tolerate?
Cranberry 'Stevens' starts to suffer below roughly -30°C. It tolerates a cold dormant period within USDA 2-7, but a wet cold root zone is more dangerous than cold air.
What humidity does cranberry 'stevens' need?
Cranberry 'Stevens' prefers about Ambient outdoor, prefers moist air relative humidity. A wetland cultivar at home in cool, damp, humid conditions; grown outdoors in saturated ground, so no special indoor humidity provision is required.
How do I raise humidity for cranberry 'stevens'?
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 cranberry 'stevens' live outside?
Cranberry 'Stevens' is rated for USDA zone 2-7 and RHS hardiness H7. 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 cranberry 'stevens' care
In the UK? Keeping cranberry 'stevens' warm in a UK home covers the radiator, single-glazing and heating-season humidity angle. Temperature and humidity are one piece. See the full cranberry 'stevens' care guide, its cold-hardiness guide, and watering schedule — humidity and watering problems are easy to confuse.