Cold hardiness & minimum temperature

Is Schismatoglottis Wallichii (Schismatoglottis wallichii)cold hardy? Hardiness zone & min temp

Also called Wallich's schismatoglottis.

More about schismatoglottis wallichii

About Schismatoglottis Wallichii

Schismatoglottis wallichii · also called Wallich's schismatoglottis · tropical

Schismatoglottis wallichii is a clumping Southeast Asian aroid with arrow- to lance-shaped green leaves, often with a silvery central band, on a low rosette. A warm, humid rainforest understory plant, it makes an easy terrarium or shaded houseplant given steady moisture and warmth. Like other Araceae, it contains insoluble calcium oxalates and is toxic to cats and dogs.

Cold limit: USDA 11-12 (indoor in most US homes) · RHS H1a (20-29°C)

What schismatoglottis wallichii's hardiness rating actually means

Schismatoglottis Wallichii 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 (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 above about 15 °C (warm, never cold). Schismatoglottis Wallichii has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

Concretely, for schismatoglottis wallichii 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 schismatoglottis wallichii 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 schismatoglottis wallichii can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H1a figure above.

Schismatoglottis Wallichii hardiness — frequently asked questions

Is schismatoglottis wallichii cold hardy?

Schismatoglottis Wallichii 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. Schismatoglottis Wallichii can only live outside year-round in genuinely frost-free climates (roughly USDA 11-12 (indoor in most US homes)); everywhere else it is a houseplant that summers out at most.

What is the minimum temperature schismatoglottis wallichii can survive?

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

What hardiness zone is schismatoglottis wallichii?

Schismatoglottis Wallichii is rated USDA 11-12 (indoor in most US homes) and RHS H1a — Tropical — needs a heated room or greenhouse; no frost tolerance whatsoever.

Can schismatoglottis wallichii 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 schismatoglottis wallichii 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.