Cold hardiness & minimum temperature

Is Bertolonia Marmorata (Bertolonia marmorata)cold hardy? Hardiness zone & min temp

Also called jewel plant, marbled bertolonia.

More about bertolonia marmorata

About Bertolonia Marmorata

Bertolonia marmorata · also called jewel plant, marbled bertolonia · houseplant

Bertolonia marmorata, the jewel plant, is a small Brazilian rainforest creeper in the Melastomataceae grown for velvety, iridescent green leaves marbled silver with reddish-purple undersides. A true terrarium gem, it demands constant high humidity, warmth, and gentle light. The closely related Bertolonia mosaica is ASPCA-listed non-toxic, so the genus is considered pet-safe.

Cold limit: USDA 11-12 (terrarium/indoor in most US homes) · RHS H1b (18-27°C)

Watch for — Stalled growth or rot from cold/wet: Cold temperatures below ~16°C combined with constant wet trigger rot and stagnation. Keep it warm and stable, and use an airy, fast-draining substrate.

What bertolonia marmorata's hardiness rating actually means

Bertolonia Marmorata 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 (terrarium/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). Bertolonia Marmorata has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

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

Bertolonia Marmorata hardiness — frequently asked questions

Is bertolonia marmorata cold hardy?

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

What is the minimum temperature bertolonia marmorata can survive?

What hardiness zone is bertolonia marmorata?

Bertolonia Marmorata is rated USDA 11-12 (terrarium/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 bertolonia marmorata 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 bertolonia marmorata 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.