Cold hardiness & minimum temperature

Is Golden Corkscrew Plant (Genlisea aurea)cold hardy? Hardiness zone & min temp

Also called golden corkscrew plant, corkscrew plant.

More about golden corkscrew plant

About Golden Corkscrew Plant

Genlisea aurea · also called golden corkscrew plant, corkscrew plant · houseplant

A tiny Brazilian carnivore notable for having one of the smallest known plant genomes. Produces bright yellow flowers on slender 10–15 cm scapes above a rosette of flat spatula-shaped leaves. Traps microscopic soil organisms (protists, nematodes) via underground corkscrew-shaped modified leaves. Thrives in warm, very wet, bright conditions in a carnivorous terrarium.

Cold limit: USDA 11–12 · RHS H1a (18–30°C year-round)

Watch for — Slow or no growth in cold conditions: G. aurea is a warm-tropical species and stops growing below 18°C. In a cool room or in winter without supplemental heating, the plant can stall and decline. A heated terrarium or heat mat maintaining 22–26°C resolves this.

What golden corkscrew plant's hardiness rating actually means

Golden Corkscrew 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 H1a means: Tropical — needs a heated room or greenhouse; no frost tolerance whatsoever. On the US scale that maps to USDA 11–12 — 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 above about 15 °C (warm, never cold). Golden Corkscrew Plant has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

Concretely, for golden corkscrew plant as it gets too cold:

Below about above about 15 °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 golden corkscrew plant go outside or overwinter — and where?

It can holiday outdoors in summer once nights are reliably above above 15 °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 golden corkscrew plant can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H1a figure above.

Golden Corkscrew Plant hardiness — frequently asked questions

Is golden corkscrew plant cold hardy?

Golden Corkscrew 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. Golden Corkscrew Plant can only live outside year-round in genuinely frost-free climates (roughly USDA 11–12); everywhere else it is a houseplant that summers out at most.

What is the minimum temperature golden corkscrew plant can survive?

Minimum survivable temperature is roughly above about 15 °C (warm, never cold). Golden Corkscrew Plant has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

What hardiness zone is golden corkscrew plant?

Golden Corkscrew Plant is rated USDA 11–12 and RHS H1a — Tropical — needs a heated room or greenhouse; no frost tolerance whatsoever.

Can golden corkscrew plant survive winter outside?

It can holiday outdoors in summer once nights are reliably above above 15 °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 golden corkscrew plant below its minimum temperature?

Below about above about 15 °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.