Cold hardiness & minimum temperature

Is Begonia 'Tom Ment' (Begonia 'Tom Ment')cold hardy? Hardiness zone & min temp

Also called Tom Ment begonia.

More about begonia 'tom ment'

About Begonia 'Tom Ment'

Begonia 'Tom Ment' · also called Tom Ment begonia · houseplant

Begonia 'Tom Ment' is a compact rhizomatous foliage begonia grown for its low, spreading rosette of textured, often puckered leaves with dark patterning. Collected for its tidy form and ornamental foliage rather than showy flowers, it sends up airy pale blooms in late winter. It thrives in warm, humid, bright-indirect conditions with an open mix and careful watering.

Cold limit: USDA 10-12 (indoor in most US homes) · RHS H1b (18-26°C)

What begonia 'tom ment''s hardiness rating actually means

Begonia 'Tom Ment' 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 US homes) — 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). Begonia 'Tom Ment' has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

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

Begonia 'Tom Ment' hardiness — frequently asked questions

Is begonia 'tom ment' cold hardy?

Begonia 'Tom Ment' 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 'Tom Ment' can only live outside year-round in genuinely frost-free climates (roughly USDA 10-12 (indoor in most US homes)); everywhere else it is a houseplant that summers out at most.

What is the minimum temperature begonia 'tom ment' can survive?

What hardiness zone is begonia 'tom ment'?

Begonia 'Tom Ment' is rated USDA 10-12 (indoor in most US homes) and RHS H1b — Sub-tropical — a normal warm home is fine, but it cannot go outside in a cool season.

Can begonia 'tom ment' 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 begonia 'tom ment' 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.