Cold hardiness & minimum temperature

Is Begonia 'Maori Haze' (Begonia rex 'Maori Haze')cold hardy? Hardiness zone & min temp

Also called Maori Haze Begonia, Rex Begonia 'Maori Haze', Painted-Leaf Begonia 'Maori Haze'.

More about begonia 'maori haze'

About Begonia 'Maori Haze'

Begonia rex 'Maori Haze' · also called Maori Haze Begonia, Rex Begonia 'Maori Haze' · houseplant

Begonia 'Maori Haze' is a rhizomatous Rex begonia grown for silvery, pewter-purple, pointed foliage. It thrives in bright indirect light, high humidity above 50%, and evenly moist but well-drained soil. Compact at 10-50cm tall, it suits warm, sheltered indoor spots. Toxic to cats and dogs per the ASPCA, so keep it out of reach.

Cold limit: USDA RHS H1B (tender; min 10°C). Outdoors only in USDA zones 10-11; grown as a houseplant elsewhere. (18-24°C (minimum 10°C))

Watch for — Crispy brown leaf edges: Almost always a sign of air that is too dry. Raise humidity above 50% with a pebble tray or by grouping plants; keep away from radiators and cold draughts.

What begonia 'maori haze''s hardiness rating actually means

Begonia 'Maori Haze' 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 (tender; min 10°C). Outdoors only in USDA zones 10-11; grown as a houseplant elsewhere. — 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). Begonia 'Maori Haze' has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

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

Begonia 'Maori Haze' hardiness — frequently asked questions

Is begonia 'maori haze' cold hardy?

Begonia 'Maori Haze' 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 'Maori Haze' can only live outside year-round in genuinely frost-free climates (roughly USDA RHS H1B (tender; min 10°C). Outdoors only in USDA zones 10-11; grown as a houseplant elsewhere.); everywhere else it is a houseplant that summers out at most.

What is the minimum temperature begonia 'maori haze' can survive?

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

What hardiness zone is begonia 'maori haze'?

Begonia 'Maori Haze' is rated USDA RHS H1B (tender; min 10°C). Outdoors only in USDA zones 10-11; grown as a houseplant elsewhere. and RHS H1c — Warm-temperate — can summer outdoors but must come in well before the first frost.

Can begonia 'maori haze' 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 begonia 'maori haze' 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.