Cold hardiness & minimum temperature

Is Candy Corn Plant (Nematanthus strigillosus)cold hardy? Hardiness zone & min temp

Also called Candy Corn Plant, Goldfish Plant, Clog Plant.

More about candy corn plant

About Candy Corn Plant

Nematanthus strigillosus · also called Candy Corn Plant, Goldfish Plant · houseplant

Candy Corn Plant is a charming trailing gesneriad with glossy, dark green leaves and distinctive puffy orange and yellow pouched flowers that resemble tiny candy corn or goldfish. It blooms most freely when slightly root-bound in bright indirect light. As a gesneriad, it is considered non-toxic to pets.

Cold limit: USDA 10-12 (indoor-only in most homes) · RHS H1c (16-27°C)

Watch for — Failure to bloom: Most commonly due to low light or an oversized pot. Increase light levels and keep the plant slightly pot-bound; a short cooler rest in winter can also trigger flowering.

What candy corn plant's hardiness rating actually means

Candy Corn Plant 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 10-12 (indoor-only in most 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). Candy Corn Plant has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

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

Candy Corn Plant hardiness — frequently asked questions

Is candy corn plant cold hardy?

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

What is the minimum temperature candy corn plant can survive?

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

What hardiness zone is candy corn plant?

Candy Corn Plant is rated USDA 10-12 (indoor-only in most homes) and RHS H1c — Warm-temperate — can summer outdoors but must come in well before the first frost.

Can candy corn plant 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 candy corn plant 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.