Cold hardiness & minimum temperature

Is Palm Leaf Begonia (Begonia luxurians)cold hardy? Hardiness zone & min temp

Also called Palm Leaf Begonia, Palm-leaf Begonia, Shrub Begonia.

More about palm leaf begonia

About Palm Leaf Begonia

Begonia luxurians · also called Palm Leaf Begonia, Palm-leaf Begonia · houseplant

Palm Leaf Begonia (Begonia luxurians) is a fast-growing, cane-stemmed Brazilian species prized for its fan of slender, palm-like leaflets. Grow it in bright indirect light, evenly moist well-draining soil, warmth and high humidity. The ASPCA lists Begonia as toxic to cats, dogs and horses, so keep it out of pets' reach.

Cold limit: USDA 9b-12 outdoors; grown as a houseplant or overwintered indoors in cooler zones (15-30C)

Watch for — Leaf drop: Sudden shedding usually follows cold draughts, temperatures below 10C, or a sharp change in conditions. Keep it warm, draught-free, and away from cold windows in winter.

What palm leaf begonia's hardiness rating actually means

Palm Leaf 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 9b-12 outdoors; grown as a houseplant or overwintered indoors 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 10 °C (sustained cold below this is damaging). Palm Leaf Begonia has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

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

Palm Leaf Begonia hardiness — frequently asked questions

Is palm leaf begonia cold hardy?

Palm Leaf 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. Palm Leaf Begonia can only live outside year-round in genuinely frost-free climates (roughly USDA 9b-12 outdoors; grown as a houseplant or overwintered indoors in cooler zones); everywhere else it is a houseplant that summers out at most.

What is the minimum temperature palm leaf begonia can survive?

What hardiness zone is palm leaf begonia?

Palm Leaf Begonia is rated USDA 9b-12 outdoors; grown as a houseplant or overwintered indoors in cooler zones and RHS H1b — Sub-tropical — a normal warm home is fine, but it cannot go outside in a cool season.

Can palm leaf 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 palm leaf 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.