Plant care
'Black Krim' Tomatotemperature & humidity
Solanum lycopersicum 'Black Krim'
More about 'black krim' tomato
Ideal temperature for 'black krim' tomato
Temperature kills fewer 'black krim' tomato 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 18-29°C (65-85°F) is fine; the spot you put the plant in matters more. Below roughly 18°C the damage starts — soft blackened patches, translucent leaves, sometimes overnight.
Cold tolerance & winter care
'Black Krim' Tomato is frost-tender (USDA Warm-season annual in zones 3-11; perennial only in frost-free zones 10-11, RHS H2 (tender; no frost tolerance)). It cannot survive a frost, so in most of the US and UK it lives indoors year-round or summers outside and comes back in well before the first autumn frost — once nights drop toward 10-12°C is the cue, not the first frost warning. Acclimate it over a week when moving between indoors and out so the leaves do not shock.
Humidity for 'black krim' tomato
'Black Krim' Tomato sits happiest at around 40-70% relative humidity. Adaptable outdoors. The large soft fruit and dense canopy make airflow important; humid, crowded plants are vulnerable to blight and botrytis. 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 Krim' Tomato temperature & humidity — frequently asked questions
What temperature is best for 'black krim' tomato?
'Black Krim' Tomato grows best between 18-29°C (65-85°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 krim' tomato tolerate?
'Black Krim' Tomato starts to suffer below roughly 18°C. It is frost-tender and will be damaged or killed by a frost, so bring it indoors once nights fall toward 10-12°C.
What humidity does 'black krim' tomato need?
'Black Krim' Tomato prefers about 40-70% relative humidity. Adaptable outdoors. The large soft fruit and dense canopy make airflow important; humid, crowded plants are vulnerable to blight and botrytis.
How do I raise humidity for 'black krim' tomato?
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 krim' tomato live outside?
'Black Krim' Tomato is rated for USDA zone Warm-season annual in zones 3-11; perennial only in frost-free zones 10-11 and RHS hardiness H2 (tender; no frost tolerance). Outside that range it must come indoors before the first frost — treat any outdoor stint as a summer holiday, not a permanent home.
More 'black krim' tomato care
In the UK? Keeping 'black krim' tomato 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 krim' tomato care guide, its cold-hardiness guide, and watering schedule — humidity and watering problems are easy to confuse.