Cold hardiness & minimum temperature

Is Brazilian Sinningia (Sinningia brasiliensis)cold hardy? Hardiness zone & min temp

Also called Brazilian Sinningia, Bat-pollinated Sinningia.

More about brazilian sinningia

About Brazilian Sinningia

Sinningia brasiliensis · also called Brazilian Sinningia, Bat-pollinated Sinningia · tropical

Sinningia brasiliensis is a tuberous perennial native to the rocky outcrops (rupicola habitat) of eastern Brazil, where it is adapted to bat pollination — one of the few Sinningia species with this adaptation. It produces large, gullet-shaped greenish-cream tubular flowers that release scent and nectar intensely at midnight to attract glossophagine bats. Keep it in bright indirect light with well-draining, organic-rich compost and allow the tuber to rest after flowering by reducing water. The ASPCA lists Sinningia (Gloxinia) as non-toxic to cats and dogs.

Cold limit: USDA 10-12 (indoor in most climates) · RHS H1b (16–26°C)

Watch for — Root and tuber rot: Overwatering or poorly draining compost quickly rots the tuber; ensure the pot has drainage holes and allow the mix to partially dry between waterings, especially in winter.

What brazilian sinningia's hardiness rating actually means

Brazilian 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 10-12 (indoor in most climates) — 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). Brazilian Sinningia has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

Concretely, for brazilian 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 brazilian 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 brazilian sinningia can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H1b figure above.

Brazilian Sinningia hardiness — frequently asked questions

Is brazilian sinningia cold hardy?

Brazilian 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. Brazilian Sinningia can only live outside year-round in genuinely frost-free climates (roughly USDA 10-12 (indoor in most climates)); everywhere else it is a houseplant that summers out at most.

What is the minimum temperature brazilian sinningia can survive?

What hardiness zone is brazilian sinningia?

Brazilian Sinningia is rated USDA 10-12 (indoor in most climates) and RHS H1b — Sub-tropical — a normal warm home is fine, but it cannot go outside in a cool season.

Can brazilian 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 brazilian 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.