Cold hardiness & minimum temperature

Is Patini's Peace Lily (Spathiphyllum patinii)cold hardy? Hardiness zone & min temp

Also called Patini Peace Lily, White Sails, Spathe Flower.

More about patini's peace lily

About Patini's Peace Lily

Spathiphyllum patinii · also called Patini Peace Lily, White Sails · houseplant

Spathiphyllum patinii is a species peace lily from tropical South America with elegant white spathe flowers and glossy dark-green foliage. It is one of the best low-light houseplants available, actively filtering indoor air. Like all Spathiphyllum species, it contains calcium oxalates and is toxic to cats, dogs, and humans if ingested.

Cold limit: USDA 10–12 (indoor-only in most climates) · RHS H1c (15–27°C)

Watch for — Failure to flower: Insufficient light is the main reason peace lilies stop blooming. Move to a brighter (but still indirect) position; a light-boosting move in late winter often triggers spring flowering.

What patini's peace lily's hardiness rating actually means

Patini's 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 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 climates) — 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). Patini's Peace Lily has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

Concretely, for patini's peace lily 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 patini's peace lily 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 patini's peace lily can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H1c figure above.

Patini's Peace Lily hardiness — frequently asked questions

Is patini's peace lily cold hardy?

Patini's 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. Patini's Peace Lily can only live outside year-round in genuinely frost-free climates (roughly USDA 10–12 (indoor-only in most climates)); everywhere else it is a houseplant that summers out at most.

What is the minimum temperature patini's peace lily can survive?

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

What hardiness zone is patini's peace lily?

Patini's Peace Lily is rated USDA 10–12 (indoor-only in most climates) and RHS H1c — Warm-temperate — can summer outdoors but must come in well before the first frost.

Can patini's peace lily 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 patini's peace lily 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.