Cold hardiness & minimum temperature

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

Also called malanga, tannia, cocoyam, yautia.

More about xanthosoma sagittifolium

About Xanthosoma Sagittifolium

Xanthosoma sagittifolium · also called malanga, tannia · edible

Xanthosoma sagittifolium, the new-world malanga or tannia, is a large tropical aroid grown for its edible corms and arrow-shaped (sagittate) leaves held upward, distinguishing it from Colocasia. It demands warmth, fertile moist soil and humidity, and grows fast in a season. Every raw part contains calcium oxalate and requires thorough cooking before eating.

Cold limit: USDA 9-11 (corms lifted and stored where frost occurs) · RHS H1c (20-30°C)

Watch for — Corm rot during storage: Lifted corms rot if stored damp or chilled; cure and store dry and frost-free over winter.

What xanthosoma sagittifolium's hardiness rating actually means

Xanthosoma Sagittifolium 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 (corms lifted and stored where frost occurs) — 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 Sagittifolium has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

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

Xanthosoma Sagittifolium hardiness — frequently asked questions

Is xanthosoma sagittifolium cold hardy?

Xanthosoma Sagittifolium 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 Sagittifolium can only live outside year-round in genuinely frost-free climates (roughly USDA 9-11 (corms lifted and stored where frost occurs)); everywhere else it is a houseplant that summers out at most.

What is the minimum temperature xanthosoma sagittifolium can survive?

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

What hardiness zone is xanthosoma sagittifolium?

Xanthosoma Sagittifolium is rated USDA 9-11 (corms lifted and stored where frost occurs) and RHS H1c — Warm-temperate — can summer outdoors but must come in well before the first frost.

Can xanthosoma sagittifolium 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 sagittifolium 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.