Cold hardiness & minimum temperature

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

Also called Luzon begonia, Luzon rhizomatous begonia.

More about luzon begonia

About Luzon Begonia

Begonia luzonensis · also called Luzon begonia, Luzon rhizomatous begonia · tropical

Begonia luzonensis is a rhizomatous species endemic to Luzon island in the Philippines, where it inhabits humid tropical forest floors. Its striking, silvery-green leaves with dark olive veining and fringed margins make it a popular terrarium and vivarium plant, as it thrives in the very high humidity of enclosed environments. It produces small white flowers with soft pink tinges and creeps across the growing medium via its surface rhizomes. Begonia is listed as toxic to cats, dogs, and horses by the ASPCA.

Cold limit: USDA 11-12 (indoor in most climates) · RHS H1b (18–28°C)

Watch for — Leaf curl and browning tips: Humidity dropping below 60% causes leaf edges to curl and brown; this is especially common in winter with indoor heating — maintain humidity with a humidifier or move to a terrarium.

What luzon begonia's hardiness rating actually means

Luzon 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 11-12 (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). Luzon Begonia has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

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

Luzon Begonia hardiness — frequently asked questions

Is luzon begonia cold hardy?

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

What is the minimum temperature luzon begonia can survive?

What hardiness zone is luzon begonia?

Luzon Begonia is rated USDA 11-12 (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 luzon 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 luzon 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.