Cold hardiness & minimum temperature

Is large-stalked sinningia (Sinningia macropoda)cold hardy? Hardiness zone & min temp

Also called large-stalked sinningia.

More about large-stalked sinningia

About large-stalked sinningia

Sinningia macropoda · also called large-stalked sinningia · houseplant

Sinningia macropoda is a tuberous Brazilian gesneriad notable for its stout, prominently thick flower stalks and clusters of tubular scarlet to orange-red flowers that emerge dramatically from a dormant tuber. A caudex-forming species, it is prized by collectors for its architectural appeal in addition to its seasonal flower display.

Cold limit: USDA 11-12 · RHS H1b (15–28°C)

Watch for — Root rot: Waterlogged medium, especially in cool temperatures, quickly causes root and caudex rot. Always use a pot with drainage holes and a very free-draining mix.

What large-stalked sinningia's hardiness rating actually means

large-stalked sinningia is not cold hardy. It is a tropical houseplant that dies if it is left out through frost — there is no zone where it overwinters outdoors in a UK or cold-US climate. Its RHS rating of H1b means: Sub-tropical — a normal warm home is fine, but it cannot go outside in a cool season. On the US scale that maps to USDA 11-12 — the zones where it can be left outdoors year-round.

New to these scales? The USDA hardiness zone map explained covers how the zone numbers work, and you can find your own zone with the zone finder.

Minimum temperature — and what happens below it

Minimum survivable temperature is roughly about 10 °C (sustained cold below this is damaging). large-stalked sinningia has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

Concretely, for large-stalked sinningia as it gets too cold:

Below about about 10 °C, growth stalls and the leaves start to show cold stress — dark, water-soaked, or yellowing patches.
A single light frost blackens the foliage; a hard freeze kills the whole plant, roots included, and it does not recover.
Even a cold, draughty windowsill or an unheated porch in winter can be enough to damage it permanently.

Can large-stalked sinningia go outside or overwinter — and where?

It can holiday outdoors in summer once nights are reliably above 10 °C, in shade or dappled light, hardened off gradually.
Bring it back indoors well before the first autumn frost — do not wait for a frost warning, move it when nights drop toward 10-12 °C.
It will never overwinter outside in a temperate climate; the indoors is its winter home, full stop.

Work back from your local frost dates with the frost-date calculator: the last spring frost and first autumn frost are what really decide when large-stalked sinningia can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H1b figure above.

large-stalked sinningia hardiness — frequently asked questions

Is large-stalked sinningia cold hardy?

large-stalked sinningia is not cold hardy. It is a tropical houseplant that dies if it is left out through frost — there is no zone where it overwinters outdoors in a UK or cold-US climate. Indoor-only in almost every home. large-stalked sinningia can only live outside year-round in genuinely frost-free climates (roughly USDA 11-12); everywhere else it is a houseplant that summers out at most.

What is the minimum temperature large-stalked sinningia can survive?

What hardiness zone is large-stalked sinningia?

large-stalked sinningia is rated USDA 11-12 and RHS H1b — Sub-tropical — a normal warm home is fine, but it cannot go outside in a cool season.

Can large-stalked sinningia survive winter outside?

It can holiday outdoors in summer once nights are reliably above 10 °C, in shade or dappled light, hardened off gradually. Bring it back indoors well before the first autumn frost — do not wait for a frost warning, move it when nights drop toward 10-12 °C. It will never overwinter outside in a temperate climate; the indoors is its winter home, full stop.

What happens to large-stalked sinningia below its minimum temperature?

Below about about 10 °C, growth stalls and the leaves start to show cold stress — dark, water-soaked, or yellowing patches. A single light frost blackens the foliage; a hard freeze kills the whole plant, roots included, and it does not recover. Even a cold, draughty windowsill or an unheated porch in winter can be enough to damage it permanently.