Cold hardiness & minimum temperature

Is Five-Fingers Syngonium (Syngonium auritum)cold hardy? Hardiness zone & min temp

Also called Five-Fingers, American Evergreen, Gold Allusion Syngonium.

More about five-fingers syngonium

About Five-Fingers Syngonium

Syngonium auritum · also called Five-Fingers, American Evergreen · tropical

Five-Fingers Syngonium is a vigorous Caribbean and Central American aroid with distinctive deeply lobed, five-fingered mature leaves and a vining or climbing habit. It is one of the more robust Syngonium species for indoor culture. Toxic to pets and humans due to insoluble calcium oxalate crystals; keep away from animals.

Cold limit: USDA 10-12 · RHS H1b (16-29°C)

What five-fingers syngonium's hardiness rating actually means

Five-Fingers Syngonium 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 — 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). Five-Fingers Syngonium has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

Concretely, for five-fingers syngonium 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 five-fingers syngonium 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 five-fingers syngonium can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H1b figure above.

Five-Fingers Syngonium hardiness — frequently asked questions

Is five-fingers syngonium cold hardy?

Five-Fingers Syngonium 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. Five-Fingers Syngonium can only live outside year-round in genuinely frost-free climates (roughly USDA 10-12); everywhere else it is a houseplant that summers out at most.

What is the minimum temperature five-fingers syngonium can survive?

What hardiness zone is five-fingers syngonium?

Five-Fingers Syngonium is rated USDA 10-12 and RHS H1b — Sub-tropical — a normal warm home is fine, but it cannot go outside in a cool season.

Can five-fingers syngonium 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 five-fingers syngonium 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.