Cold hardiness & minimum temperature

Is Alocasia Lauterbachiana (Purple Sword) (Alocasia lauterbachiana)cold hardy? Hardiness zone & min temp

Also called Purple Sword, Purple Sword Alocasia, Lauterbach's Alocasia, Silver Edge Alocasia.

More about alocasia lauterbachiana (purple sword)

About Alocasia Lauterbachiana (Purple Sword)

Alocasia lauterbachiana · also called Purple Sword, Purple Sword Alocasia · tropical

Alocasia lauterbachiana, or Purple Sword, is a striking tropical aroid prized for narrow, wavy-edged leaves with purple-burgundy undersides. It wants bright indirect light, evenly moist but never soggy soil, warmth, and high humidity. The ASPCA lists Alocasia as toxic to cats and dogs, so keep it well out of pets' reach.

Cold limit: USDA 10-12 (grown as a houseplant elsewhere; RHS H1b) (18-27 C)

What alocasia lauterbachiana (purple sword)'s hardiness rating actually means

Alocasia Lauterbachiana (Purple Sword) 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 (grown as a houseplant elsewhere; RHS H1b) — 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). Alocasia Lauterbachiana (Purple Sword) has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

Concretely, for alocasia lauterbachiana (purple sword) 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 alocasia lauterbachiana (purple sword) 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 alocasia lauterbachiana (purple sword) can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H1c figure above.

Alocasia Lauterbachiana (Purple Sword) hardiness — frequently asked questions

Is alocasia lauterbachiana (purple sword) cold hardy?

Alocasia Lauterbachiana (Purple Sword) 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 Lauterbachiana (Purple Sword) can only live outside year-round in genuinely frost-free climates (roughly USDA 10-12 (grown as a houseplant elsewhere; RHS H1b)); everywhere else it is a houseplant that summers out at most.

What is the minimum temperature alocasia lauterbachiana (purple sword) can survive?

What hardiness zone is alocasia lauterbachiana (purple sword)?

Alocasia Lauterbachiana (Purple Sword) is rated USDA 10-12 (grown as a houseplant elsewhere; RHS H1b) and RHS H1c — Warm-temperate — can summer outdoors but must come in well before the first frost.

Can alocasia lauterbachiana (purple sword) 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 alocasia lauterbachiana (purple sword) 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.