Cold hardiness & minimum temperature

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

Also called Mauna Loa, Giant Peace Lily, White Anthurium.

More about mauna loa peace lily

About Mauna Loa Peace Lily

Spathiphyllum cochlearispathum · also called Mauna Loa, Giant Peace Lily · houseplant

Spathiphyllum cochlearispathum is a large-growing Araceae from Central America, bearing broad, glossy deep-green leaves and tall white spathes that tower above the foliage. It is one of the largest peace lily species and a classic low-light tolerant houseplant. All parts are toxic to pets and people due to insoluble calcium oxalate crystals.

Cold limit: USDA 10-12 (indoor-only in temperate climates) · RHS H1b (16-27°C)

Watch for — Failure to bloom: Insufficient light is the most common cause. Move to a brighter spot; some growers briefly expose the plant to cooler night temperatures (around 15°C) to trigger flowering.

What mauna loa peace lily's hardiness rating actually means

Mauna Loa 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 10-12 (indoor-only in temperate 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 10 °C (sustained cold below this is damaging). Mauna Loa Peace Lily has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

Concretely, for mauna loa 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 mauna loa 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 mauna loa 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.

Mauna Loa Peace Lily hardiness — frequently asked questions

Is mauna loa peace lily cold hardy?

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

What is the minimum temperature mauna loa peace lily can survive?

What hardiness zone is mauna loa peace lily?

Mauna Loa Peace Lily is rated USDA 10-12 (indoor-only in temperate climates) and RHS H1b — Sub-tropical — a normal warm home is fine, but it cannot go outside in a cool season.

Can mauna loa 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 mauna loa 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.