Cold hardiness & minimum temperature

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

Also called penwiper plant, spotted kalanchoe, marble leaf kalanchoe.

More about kalanchoe marmorata

About Kalanchoe Marmorata

Kalanchoe marmorata · also called penwiper plant, spotted kalanchoe · houseplant

Kalanchoe marmorata, the penwiper plant, is an East African succulent grown for large, paddle-shaped grey-green leaves blotched with purple-brown markings like ink stains. Mature plants raise tall stems of white tubular flowers. It needs sharp drainage and moderate watering, and like all Kalanchoe it is toxic to pets due to cardiac glycosides.

Cold limit: USDA 10-11 (indoor in most US homes) · RHS H1c (needs minimum about 10°C; protect from any frost) (18-27°C)

What kalanchoe marmorata's hardiness rating actually means

Kalanchoe 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 H1c means: Warm-temperate — can summer outdoors but must come in well before the first frost. On the US scale that maps to USDA 10-11 (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 5 °C (and never frost). Kalanchoe Marmorata has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

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

Kalanchoe Marmorata hardiness — frequently asked questions

Is kalanchoe marmorata cold hardy?

Kalanchoe 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. Kalanchoe Marmorata can only live outside year-round in genuinely frost-free climates (roughly USDA 10-11 (indoor in most US homes)); everywhere else it is a houseplant that summers out at most.

What is the minimum temperature kalanchoe marmorata can survive?

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

What hardiness zone is kalanchoe marmorata?

Kalanchoe Marmorata is rated USDA 10-11 (indoor in most US homes) and RHS H1c — Warm-temperate — can summer outdoors but must come in well before the first frost.

Can kalanchoe marmorata 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 kalanchoe marmorata 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.