Cold hardiness & minimum temperature

Is Alocasia Polly (Alocasia × amazonica 'Polly')cold hardy? Hardiness zone & min temp

Also called African mask plant, Amazonian elephant's ear 'Polly', Polly alocasia, Elephant's ear.

More about alocasia polly

About Alocasia Polly

Alocasia × amazonica 'Polly' · also called African mask plant, Amazonian elephant's ear 'Polly' · tropical

Alocasia 'Polly' is a compact tropical aroid prized for its arrow-shaped, near-black leaves laced with bold white-green veins. Its one defining need is steady warmth and high humidity: keep it above 15°C in bright, indirect light, never soggy and never bone-dry. Treat it as a fussy but rewarding indoor specimen rather than a beginner houseplant.

Cold limit: USDA 10-12 (only outdoors in frost-free tropical climates; grown as a houseplant elsewhere) · RHS H1a (must be grown under glass / indoors all year, minimum above 15°C) (18-27°C)

Watch for — Dormancy / sudden collapse: Falling light and temperature in autumn can trigger drooping and leaf drop. The rhizome is usually still alive, so reduce watering, keep it warm above 15°C and wait; fresh leaves often appear when conditions improve in spring.

What alocasia polly's hardiness rating actually means

Alocasia Polly 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 10-12 (only outdoors in frost-free tropical climates; grown as a houseplant elsewhere) — 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). Alocasia Polly has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

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

Alocasia Polly hardiness — frequently asked questions

Is alocasia polly cold hardy?

Alocasia Polly 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. Alocasia Polly can only live outside year-round in genuinely frost-free climates (roughly USDA 10-12 (only outdoors in frost-free tropical climates; grown as a houseplant elsewhere)); everywhere else it is a houseplant that summers out at most.

What is the minimum temperature alocasia polly can survive?

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

What hardiness zone is alocasia polly?

Alocasia Polly is rated USDA 10-12 (only outdoors in frost-free tropical climates; grown as a houseplant elsewhere) and RHS H1a — Tropical — needs a heated room or greenhouse; no frost tolerance whatsoever.

Can alocasia polly 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 alocasia polly 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.