UK temperature
Keeping russian banana fingerling potato warm in a UK home
Solanum tuberosum 'Russian Banana'
More about russian banana fingerling potato in the UK
The UK home, in plant terms
A typical UK home creates two opposite micro-problems at the same time. Radiator-driven heating spikes the air temperature and crashes humidity in the rooms where people actually sit; the older the housing stock the more likely a single-glazed window pane is sitting at near-freezing in January with a houseplant against it. Cold unheated bedrooms, north-facing rooms and conservatories without heating run far cooler than the thermostat suggests, and the British winter gives the lowest indoor daylight in any of Growli's markets. Russian Banana Fingerling Potato is frost-tender, so the radiator-warmed side of the house is right for it in winter — just not pressed against a cold pane or directly in the radiator updraft.
The actual numbers
Ideally russian banana fingerling potato sits between 15-20°C (tubers set best with soil 15-18°C; bulking slows above 27°C). (That is 60-70°F in Fahrenheit.) Outdoor ambient humidity is fine. As a long-season variety it spends more time exposed to blight weather, so prioritise airflow and base watering. Watch for the room dropping below about 15°C overnight — common in UK unheated bedrooms in January, and the point where growth stalls and leaves chill-mark.
For the RHS hardiness side of this, see is russian banana fingerling potato hardy in the UK? (rating RHS H2 (foliage frost-tender), sourced from the RHS rating system). For the US/USDA framing of the same numbers, see the russian banana fingerling potato temperature guide.
Winter placement in a UK home
For russian banana fingerling potato through a UK winter, three placement rules clear up most problems: 1) keep it at least a hand's width back from the window pane on single-glazed or very cold double-glazed glass, especially overnight when curtains close behind the plant; 2) keep it out of the direct vertical updraft above a radiator — that column of hot dry air browns leaf tips even on tolerant species; 3) judge by the room you can actually feel, not the central thermostat — many UK rooms run several degrees below the hall reading in winter. Humidity drops to roughly 25–35% in a heated UK living room; a pebble tray, grouping with other plants, or a small humidifier puts that back to a level houseplants actually like.
Russian Banana Fingerling Potato temperature in the UK — frequently asked questions
What temperature does russian banana fingerling potato need in the UK?
Russian Banana Fingerling Potato prefers 15-20°C (tubers set best with soil 15-18°C; bulking slows above 27°C) (60-70°F). The British issue is rarely the average — it is the extremes: a cold single-glazed window in January, the hot dry air directly above a radiator, or a north-facing unheated room that runs far cooler than the hall thermostat.
Will russian banana fingerling potato survive a cold UK winter room?
Russian Banana Fingerling Potato is frost-tender (RHS H2 (foliage frost-tender)). Keep it well above freezing, ideally above 10°C overnight, which means the radiator-warmed side of the house rather than an unheated bedroom or conservatory.
Can russian banana fingerling potato go on a UK windowsill in winter?
On a single-glazed or very cold pane, no — overnight the leaves pressed against the glass can drop below the plant's comfort band, especially behind drawn curtains. A small gap (a hand's width back) or thicker thermal curtains in front of the plant fixes it, and modern double-glazing usually solves it outright.
Does UK radiator-driven heating dry russian banana fingerling potato out?
Yes — UK living rooms typically run at around 25–35% relative humidity in winter. That is well below what most houseplants prefer. Russian Banana Fingerling Potato tolerates this better than the calathea-and-fern family, but a pebble tray or grouping plants still helps.
What temperature range does russian banana fingerling potato actually like?
15-20°C (tubers set best with soil 15-18°C; bulking slows above 27°C) is the comfortable band (60-70°F in Fahrenheit for reference). That covers normal UK living-room temperatures all year; the work is making sure cold pockets (windowsills, unheated rooms) and hot pockets (radiator updrafts) do not push it outside that band.
More russian banana fingerling potato care
See the full russian banana fingerling potato care guide, its UK watering (hard vs soft tap water), and UK hardiness.