Cold hardiness & minimum temperature

Is candy corn plant (Nematanthus strigillosus)cold hardy? Hardiness zone & min temp

Also called candy corn plant, goldfish plant.

More about candy corn plant

About candy corn plant

Nematanthus strigillosus · also called candy corn plant, goldfish plant · houseplant

A cheerful trailing gesneriad from Brazil's Atlantic Forest, famed for its small, pouch-shaped orange-red flowers that resemble candy corn. Dark glossy leaves contrast beautifully with the vivid blooms. Ideal for hanging baskets in bright indirect light with warm, humid conditions. Blooms heavily from spring through autumn with minimal fuss.

Cold limit: USDA 10–12 · RHS H1b (16–26°C)

Watch for — Bud drop: Sudden temperature fluctuations, cold drafts, or being moved while in bud causes buds to drop before opening. Keep in a stable, draft-free location once buds set.

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 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 — 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). 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 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 candy corn plant 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 candy corn plant can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H1b 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); everywhere else it is a houseplant that summers out at most.

What is the minimum temperature candy corn plant can survive?

What hardiness zone is candy corn plant?

candy corn plant is rated USDA 10–12 and RHS H1b — Sub-tropical — a normal warm home is fine, but it cannot go outside in a cool season.

Can candy corn plant 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 candy corn plant 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.