Cold hardiness & minimum temperature

Is Syngonium 'Three Kings' (Syngonium podophyllum 'Three Kings')cold hardy? Hardiness zone & min temp

Also called Three Kings Arrowhead, Three Kings Syngonium, Arrowhead Vine 'Three Kings', Arrowhead Plant.

More about syngonium 'three kings'

About Syngonium 'Three Kings'

Syngonium podophyllum 'Three Kings' · also called Three Kings Arrowhead, Three Kings Syngonium · houseplant

Syngonium 'Three Kings' is a fast-growing arrowhead vine prized for its creamy-green variegated, arrow-shaped leaves. It thrives in bright indirect light, evenly moist but never soggy soil, and warm, humid conditions. It trails or climbs a moss pole. The ASPCA lists Syngonium podophyllum as toxic to cats, dogs, and horses, so keep it out of reach.

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

What syngonium 'three kings''s hardiness rating actually means

Syngonium 'Three Kings' 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 (outdoors); 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 about 5 °C (and never frost). Syngonium 'Three Kings' has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

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

Syngonium 'Three Kings' hardiness — frequently asked questions

Is syngonium 'three kings' cold hardy?

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

What is the minimum temperature syngonium 'three kings' can survive?

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

What hardiness zone is syngonium 'three kings'?

Syngonium 'Three Kings' is rated USDA 10-12 (outdoors); grown as a houseplant elsewhere and RHS H1c — Warm-temperate — can summer outdoors but must come in well before the first frost.

Can syngonium 'three kings' 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 syngonium 'three kings' 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.