Cold hardiness & minimum temperature

Is Syngonium Neon Robusta (Syngonium podophyllum 'Neon Robusta')cold hardy? Hardiness zone & min temp

Also called Pink Arrowhead, Neon Robusta.

More about syngonium neon robusta

About Syngonium Neon Robusta

Syngonium podophyllum 'Neon Robusta' · also called Pink Arrowhead, Neon Robusta · houseplant

Neon Robusta is a fast, easy arrowhead vine prized for soft bubblegum-pink leaves that emerge arrow-shaped and broaden as the plant climbs. It thrives in bright indirect light, evenly moist soil and warm rooms, and tolerates average humidity better than calatheas. The pink colour is strongest in good light and fades to green in shade.

Cold limit: USDA 10-12 (indoor in most US homes) · RHS H1b (18-27°C)

What syngonium neon robusta's hardiness rating actually means

Syngonium Neon Robusta 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 (indoor in most US homes) — 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). Syngonium Neon Robusta has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

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

Syngonium Neon Robusta hardiness — frequently asked questions

Is syngonium neon robusta cold hardy?

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

What is the minimum temperature syngonium neon robusta can survive?

What hardiness zone is syngonium neon robusta?

Syngonium Neon Robusta is rated USDA 10-12 (indoor in most US homes) and RHS H1b — Sub-tropical — a normal warm home is fine, but it cannot go outside in a cool season.

Can syngonium neon robusta 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 syngonium neon robusta 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.