Cold hardiness & minimum temperature

Is Dragon-Shield Begonia (Begonia dracopelta)cold hardy? Hardiness zone & min temp

Also called Dragon-shield begonia, Dragon scale begonia.

More about dragon-shield begonia

About Dragon-Shield Begonia

Begonia dracopelta · also called Dragon-shield begonia, Dragon scale begonia · houseplant

Begonia dracopelta is a rare rhizomatous begonia from Central Africa, prized for its heavily textured, scale-like foliage with dramatic silver and dark-green patterning that gives the plant its dragon-shield common name. It thrives in bright, indirect light with high humidity and very well-drained compost. As a rhizomatous grower, it is particularly sensitive to crown rot if water pools around the base of the stems. All parts are toxic to cats and dogs.

Cold limit: USDA 10-12 (indoor in most climates) · RHS H1b (18–27 °C)

Watch for — Leaf spot (Xanthomonas / fungal): Water on the ornamental foliage combined with warm temperatures causes dark, water-soaked spots; water from below where possible and remove any affected leaves at the base.

What dragon-shield begonia's hardiness rating actually means

Dragon-Shield 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). Dragon-Shield Begonia has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

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

Dragon-Shield Begonia hardiness — frequently asked questions

Is dragon-shield begonia cold hardy?

Dragon-Shield 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. Dragon-Shield 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 dragon-shield begonia can survive?

What hardiness zone is dragon-shield begonia?

Dragon-Shield 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 dragon-shield 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 dragon-shield 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.