Plant care
Black Redcurranttemperature & humidity
Ribes nigrum 'Ben Lomond'
More about black redcurrant
Ideal temperature for black redcurrant
Temperature kills fewer black redcurrant 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 10-24°C (50-75°F) is fine; the spot you put the plant in matters more. Below roughly 10°C growth pauses; cold beyond that pushes it into dormancy rather than killing it outright.
Cold tolerance & winter care
Black Redcurrant is comparatively hardy (USDA 3-8 (very hardy; needs winter chill to fruit well), RHS H6). 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 black redcurrant
Black Redcurrant sits happiest at around 40-70% relative humidity. Untroubled by ambient humidity outdoors. Good airflow through an open-centre bush reduces mildew and leaf-spot risk; this cultivar already has useful mildew resistance. 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.
Black Redcurrant temperature & humidity — frequently asked questions
What temperature is best for black redcurrant?
Black Redcurrant grows best between 10-24°C (50-75°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 black redcurrant tolerate?
Black Redcurrant starts to suffer below roughly 10°C. It tolerates a cold dormant period within USDA 3-8 (very hardy; needs winter chill to fruit well), but a wet cold root zone is more dangerous than cold air.
What humidity does black redcurrant need?
Black Redcurrant prefers about 40-70% relative humidity. Untroubled by ambient humidity outdoors. Good airflow through an open-centre bush reduces mildew and leaf-spot risk; this cultivar already has useful mildew resistance.
How do I raise humidity for black redcurrant?
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 black redcurrant live outside?
Black Redcurrant is rated for USDA zone 3-8 (very hardy; needs winter chill to fruit well) and RHS hardiness H6. 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 black redcurrant care
In the UK? Keeping black redcurrant warm in a UK home covers the radiator, single-glazing and heating-season humidity angle. Temperature and humidity are one piece. See the full black redcurrant care guide, its cold-hardiness guide, and watering schedule — humidity and watering problems are easy to confuse.