Cold hardiness & minimum temperature

Is Fragrant Peace Lily (Spathiphyllum cochlearispathum)cold hardy? Hardiness zone & min temp

Also called Fragrant Peace Lily, Large Peace Lily, Mexican Peace Lily, Cochlearispathum Peace Lily.

More about fragrant peace lily

About Fragrant Peace Lily

Spathiphyllum cochlearispathum · also called Fragrant Peace Lily, Large Peace Lily · houseplant

Spathiphyllum cochlearispathum is a large-growing peace lily from Mexico and Central America, notable for strongly scented white spathes. It tolerates lower light than most houseplants, wilts dramatically when thirsty, and recovers quickly once watered. Like all peace lilies, it is toxic to cats and dogs due to insoluble calcium oxalate crystals.

Cold limit: USDA 11-12 · RHS H1b (18-30°C)

What fragrant peace lily's hardiness rating actually means

Fragrant Peace Lily 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 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 about 10 °C (sustained cold below this is damaging). Fragrant Peace Lily has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

Concretely, for fragrant peace lily 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 fragrant peace lily 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 fragrant peace lily can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H1b figure above.

Fragrant Peace Lily hardiness — frequently asked questions

Is fragrant peace lily cold hardy?

Fragrant Peace Lily 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. Fragrant Peace Lily 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 fragrant peace lily can survive?

What hardiness zone is fragrant peace lily?

Fragrant Peace Lily is rated USDA 11-12 and RHS H1b — Sub-tropical — a normal warm home is fine, but it cannot go outside in a cool season.

Can fragrant peace lily 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 fragrant peace lily 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.