Cold hardiness & minimum temperature

Is Veined Begonia (Venosa) (Begonia venosa)cold hardy? Hardiness zone & min temp

Also called Veined Begonia, Venosa Begonia, Shrub Begonia.

More about veined begonia (venosa)

About Veined Begonia (Venosa)

Begonia venosa · also called Veined Begonia, Venosa Begonia · houseplant

Begonia venosa is a thick-stemmed, succulent-type shrub begonia from eastern Brazil, prized for silvery felted leaves and fragrant white flowers. It wants bright light, restrained watering, and sharp drainage — treat it more like a succulent than a typical begonia. ASPCA lists Begonia as toxic to cats, dogs, and horses.

Cold limit: USDA RHS H1B (USDA roughly 10-11); min temperature above 10°C / 50°F — frost-tender, grow indoors or under glass (18-24°C)

Watch for — Leaf drop in cold or drafts: Sensitive to cold below about 10°C; chilly drafts or sudden temperature swings cause leaf drop. Keep it warm and away from cold windows and vents.

What veined begonia (venosa)'s hardiness rating actually means

Veined Begonia (Venosa) 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 H1c means: Warm-temperate — can summer outdoors but must come in well before the first frost. On the US scale that maps to USDA RHS H1B (USDA roughly 10-11); min temperature above 10°C / 50°F — frost-tender, grow indoors or under glass — 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 5 °C (and never frost). Veined Begonia (Venosa) has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

Concretely, for veined begonia (venosa) as it gets too cold:

Below about about 5 °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 veined begonia (venosa) go outside or overwinter — and where?

It can holiday outdoors in summer once nights are reliably above 5 °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 veined begonia (venosa) can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H1c figure above.

Veined Begonia (Venosa) hardiness — frequently asked questions

Is veined begonia (venosa) cold hardy?

Veined Begonia (Venosa) 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. Veined Begonia (Venosa) can only live outside year-round in genuinely frost-free climates (roughly USDA RHS H1B (USDA roughly 10-11); min temperature above 10°C / 50°F — frost-tender, grow indoors or under glass); everywhere else it is a houseplant that summers out at most.

What is the minimum temperature veined begonia (venosa) can survive?

Minimum survivable temperature is roughly about 5 °C (and never frost). Veined Begonia (Venosa) has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

What hardiness zone is veined begonia (venosa)?

Veined Begonia (Venosa) is rated USDA RHS H1B (USDA roughly 10-11); min temperature above 10°C / 50°F — frost-tender, grow indoors or under glass and RHS H1c — Warm-temperate — can summer outdoors but must come in well before the first frost.

Can veined begonia (venosa) survive winter outside?

It can holiday outdoors in summer once nights are reliably above 5 °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 veined begonia (venosa) below its minimum temperature?

Below about about 5 °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.