UK temperature
Keeping begonia 'pin up flame' warm in a UK home
Begonia × tuberhybrida 'Pin Up Flame'
More about begonia 'pin up flame' 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. Begonia 'Pin Up Flame' 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 begonia 'pin up flame' sits between 13-24°C (frost-tender). (That is 55-75°F (frost-tender) in Fahrenheit.) Thrives in ordinary garden and patio humidity. Airflow is more important than added moisture, since dense, damp, stagnant conditions encourage powdery mildew and grey mould on the soft tissue. Watch for the room dropping below about 13°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 begonia 'pin up flame' hardy in the UK? (rating RHS H2 (RHS-rated, frost-tender; lift and store tubers over winter), sourced from the RHS rating system). For the US/USDA framing of the same numbers, see the begonia 'pin up flame' temperature guide.
Winter placement in a UK home
For begonia 'pin up flame' 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.
Begonia 'Pin Up Flame' temperature in the UK — frequently asked questions
What temperature does begonia 'pin up flame' need in the UK?
Begonia 'Pin Up Flame' prefers 13-24°C (frost-tender) (55-75°F (frost-tender)). 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 begonia 'pin up flame' survive a cold UK winter room?
Begonia 'Pin Up Flame' is frost-tender (RHS H2 (RHS-rated, frost-tender; lift and store tubers over winter)). 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 begonia 'pin up flame' 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 begonia 'pin up flame' out?
Yes — UK living rooms typically run at around 25–35% relative humidity in winter. That is well below what most houseplants prefer. Begonia 'Pin Up Flame' tolerates this better than the calathea-and-fern family, but a pebble tray or grouping plants still helps.
What temperature range does begonia 'pin up flame' actually like?
13-24°C (frost-tender) is the comfortable band (55-75°F (frost-tender) 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 begonia 'pin up flame' care
See the full begonia 'pin up flame' care guide, its UK watering (hard vs soft tap water), and UK hardiness.