Cold hardiness & minimum temperature

Is Begonia pavonina (Begonia pavonina)cold hardy? Hardiness zone & min temp

Also called peacock begonia, iridescent begonia, blue begonia.

More about begonia pavonina

About Begonia pavonina

Begonia pavonina · also called peacock begonia, iridescent begonia · tropical

A rare Malaysian rainforest begonia whose leaves shimmer iridescent blue under low light, an adaptation by specialised chloroplasts to capture scarce photons on the forest floor. A demanding terrarium plant, it needs high humidity, warmth, low filtered light and gentle airflow. The blue sheen fades under bright light, so deliberately keep it dim.

Cold limit: USDA 11-12 (terrarium or vivarium only in temperate climates) · RHS H1a (18-27°C)

What begonia pavonina's hardiness rating actually means

Begonia pavonina 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 H1a means: Tropical — needs a heated room or greenhouse; no frost tolerance whatsoever. On the US scale that maps to USDA 11-12 (terrarium or vivarium only in temperate 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 above about 15 °C (warm, never cold). Begonia pavonina has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

Concretely, for begonia pavonina as it gets too cold:

Below about above about 15 °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 begonia pavonina go outside or overwinter — and where?

It can holiday outdoors in summer once nights are reliably above above 15 °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 begonia pavonina can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H1a figure above.

Begonia pavonina hardiness — frequently asked questions

Is begonia pavonina cold hardy?

Begonia pavonina 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. Begonia pavonina can only live outside year-round in genuinely frost-free climates (roughly USDA 11-12 (terrarium or vivarium only in temperate climates)); everywhere else it is a houseplant that summers out at most.

What is the minimum temperature begonia pavonina can survive?

Minimum survivable temperature is roughly above about 15 °C (warm, never cold). Begonia pavonina has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

What hardiness zone is begonia pavonina?

Begonia pavonina is rated USDA 11-12 (terrarium or vivarium only in temperate climates) and RHS H1a — Tropical — needs a heated room or greenhouse; no frost tolerance whatsoever.

Can begonia pavonina survive winter outside?

It can holiday outdoors in summer once nights are reliably above above 15 °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 begonia pavonina below its minimum temperature?

Below about above about 15 °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.