Cold hardiness & minimum temperature

Is Xanthosoma Albomarginatum (Xanthosoma sagittifolium 'Albomarginatum')cold hardy? Hardiness zone & min temp

Also called variegated tannia, white-edged malanga.

More about xanthosoma albomarginatum

About Xanthosoma Albomarginatum

Xanthosoma sagittifolium 'Albomarginatum' · also called variegated tannia, white-edged malanga · tropical

Xanthosoma sagittifolium 'Albomarginatum' is a variegated tannia grown for large arrow-shaped leaves marbled and edged in creamy white. The variegation makes it slower and more light-demanding than the plain green species, but it shares the same love of warmth, rich moist soil and humidity. As with all elephant ears, every part contains irritating calcium oxalate.

Cold limit: USDA 9-11 (lift or overwinter indoors below zone 9) · RHS H1c (18-30°C)

What xanthosoma albomarginatum's hardiness rating actually means

Xanthosoma Albomarginatum 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 9-11 (lift or overwinter indoors below zone 9) — 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). Xanthosoma Albomarginatum has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

Concretely, for xanthosoma albomarginatum 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 xanthosoma albomarginatum 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 xanthosoma albomarginatum can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H1c figure above.

Xanthosoma Albomarginatum hardiness — frequently asked questions

Is xanthosoma albomarginatum cold hardy?

Xanthosoma Albomarginatum 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. Xanthosoma Albomarginatum can only live outside year-round in genuinely frost-free climates (roughly USDA 9-11 (lift or overwinter indoors below zone 9)); everywhere else it is a houseplant that summers out at most.

What is the minimum temperature xanthosoma albomarginatum can survive?

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

What hardiness zone is xanthosoma albomarginatum?

Xanthosoma Albomarginatum is rated USDA 9-11 (lift or overwinter indoors below zone 9) and RHS H1c — Warm-temperate — can summer outdoors but must come in well before the first frost.

Can xanthosoma albomarginatum 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 xanthosoma albomarginatum 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.