Cold hardiness & minimum temperature

Is Irene Nuss Cane Begonia (Begonia 'Irene Nuss')cold hardy? Hardiness zone & min temp

Also called Irene Nuss begonia, Irene Nuss cane begonia, superba cane begonia.

More about irene nuss cane begonia

About Irene Nuss Cane Begonia

Begonia 'Irene Nuss' · also called Irene Nuss begonia, Irene Nuss cane begonia · houseplant

Begonia 'Irene Nuss' is a superba-type cane begonia with large, deeply incised bronze-green leaves and generous hanging clusters of deep-pink flowers with a faint gardenia-like fragrance. It originates from hybrid breeding in the cane-stemmed group and can reach 1.2-1.5 m tall under ideal indoor conditions, requiring a full-sized pot to stay upright. Bright, filtered light and allowing the top layer of compost to dry between waterings are the two most important care factors. Toxic to cats and dogs.

Cold limit: USDA 10-11 (indoor-only in most climates) · RHS H1b (16-24°C)

What irene nuss cane begonia's hardiness rating actually means

Irene Nuss Cane Begonia 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 10-11 (indoor-only 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). Irene Nuss Cane Begonia has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

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

Irene Nuss Cane Begonia hardiness — frequently asked questions

Is irene nuss cane begonia cold hardy?

Irene Nuss Cane Begonia 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. Irene Nuss Cane Begonia can only live outside year-round in genuinely frost-free climates (roughly USDA 10-11 (indoor-only in most climates)); everywhere else it is a houseplant that summers out at most.

What is the minimum temperature irene nuss cane begonia can survive?

What hardiness zone is irene nuss cane begonia?

Irene Nuss Cane Begonia is rated USDA 10-11 (indoor-only in most climates) and RHS H1b — Sub-tropical — a normal warm home is fine, but it cannot go outside in a cool season.

Can irene nuss cane begonia 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 irene nuss cane begonia 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.