Cold hardiness & minimum temperature

Is Kalanchoe Fedtschenkoi (Kalanchoe fedtschenkoi)cold hardy? Hardiness zone & min temp

Also called lavender scallops, blue grey kalanchoe, South American air plant.

More about kalanchoe fedtschenkoi

About Kalanchoe Fedtschenkoi

Kalanchoe fedtschenkoi · also called lavender scallops, blue grey kalanchoe · houseplant

A trailing Madagascan succulent with blue-grey, scallop-edged leaves that flush pink to lavender in bright light and cool weather. Stems sprawl and root where they touch soil, and tiny plantlets sometimes form along the leaf notches. Easy and fast for a Kalanchoe, but, like the whole genus, toxic to cats and dogs.

Cold limit: USDA 9-11 (indoor in most US homes) · RHS H1c (15-27°C)

What kalanchoe fedtschenkoi's hardiness rating actually means

Kalanchoe Fedtschenkoi 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 9-11 (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 Fedtschenkoi has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

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

Kalanchoe Fedtschenkoi hardiness — frequently asked questions

Is kalanchoe fedtschenkoi cold hardy?

Kalanchoe Fedtschenkoi 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 Fedtschenkoi can only live outside year-round in genuinely frost-free climates (roughly USDA 9-11 (indoor in most US homes)); everywhere else it is a houseplant that summers out at most.

What is the minimum temperature kalanchoe fedtschenkoi can survive?

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

What hardiness zone is kalanchoe fedtschenkoi?

Kalanchoe Fedtschenkoi is rated USDA 9-11 (indoor in most US homes) and RHS H1c — Warm-temperate — can summer outdoors but must come in well before the first frost.

Can kalanchoe fedtschenkoi 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 fedtschenkoi 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.