Cold hardiness & minimum temperature

Is Grape-Vine Begonia (Begonia vitifolia)cold hardy? Hardiness zone & min temp

Also called Grape-vine begonia, Grape-leaf begonia, Vine-leaf begonia.

More about grape-vine begonia

About Grape-Vine Begonia

Begonia vitifolia · also called Grape-vine begonia, Grape-leaf begonia · houseplant

Begonia vitifolia is a robust, fibrous-rooted begonia from the tropical forests of Brazil and the Guianas, bearing large, lobed leaves that closely resemble those of a grapevine. It is a vigorous grower suitable for larger indoor pots or conservatories, tolerating a wider range of light and humidity than smaller-leaved species. Consistent watering and good drainage are the most critical care requirements to sustain its large leaf area without root rot. Toxic to cats and dogs.

Cold limit: USDA 10-12 (indoor in most climates) · RHS H1b (16–28 °C)

What grape-vine begonia's hardiness rating actually means

Grape-Vine 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 10-12 (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). Grape-Vine Begonia has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

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

Grape-Vine Begonia hardiness — frequently asked questions

Is grape-vine begonia cold hardy?

Grape-Vine 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. Grape-Vine Begonia 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 grape-vine begonia can survive?

What hardiness zone is grape-vine begonia?

Grape-Vine Begonia 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 grape-vine 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 grape-vine 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.