Cold hardiness & minimum temperature

Is Escargot Begonia (Begonia rex-cultorum 'Escargot')cold hardy? Hardiness zone & min temp

Also called Escargot Begonia, Rex Begonia 'Escargot', Painted-Leaf Begonia, Snail Begonia.

More about escargot begonia

About Escargot Begonia

Begonia rex-cultorum 'Escargot' · also called Escargot Begonia, Rex Begonia 'Escargot' · houseplant

Escargot Begonia is a rhizomatous Rex begonia prized for spiral, silver-and-green snail-shell leaves. Grow it in bright indirect light, high humidity (50-70%), and a chunky, fast-draining mix kept lightly moist. Water when the top inch dries. The ASPCA lists Rex begonia as toxic to cats, dogs, and horses, so keep it out of reach.

Cold limit: USDA 10-11 (grown as a houseplant in cooler zones) (18-24C)

What escargot begonia's hardiness rating actually means

Escargot 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 H1c means: Warm-temperate — can summer outdoors but must come in well before the first frost. On the US scale that maps to USDA 10-11 (grown as a houseplant in cooler zones) — 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). Escargot Begonia has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

Concretely, for escargot begonia 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 escargot begonia 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 escargot begonia can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H1c figure above.

Escargot Begonia hardiness — frequently asked questions

Is escargot begonia cold hardy?

Escargot 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. Escargot Begonia can only live outside year-round in genuinely frost-free climates (roughly USDA 10-11 (grown as a houseplant in cooler zones)); everywhere else it is a houseplant that summers out at most.

What is the minimum temperature escargot begonia can survive?

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

What hardiness zone is escargot begonia?

Escargot Begonia is rated USDA 10-11 (grown as a houseplant in cooler zones) and RHS H1c — Warm-temperate — can summer outdoors but must come in well before the first frost.

Can escargot begonia 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 escargot begonia 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.