Cold hardiness & minimum temperature

Is New Guinea Creeper (Tecomanthe dendrophila)cold hardy? Hardiness zone & min temp

Also called New Guinea Creeper, New Guinea Tecomanthe.

More about new guinea creeper

About New Guinea Creeper

Tecomanthe dendrophila · also called New Guinea Creeper, New Guinea Tecomanthe · tropical

A rare and spectacular evergreen climber native to New Guinea, producing large, pendulous clusters of waxy, tubular deep rose-pink to red flowers directly on the old wood and main stems (cauliflory), typically in winter and spring. Suited only to tropical and warm subtropical gardens or heated glasshouses. A collector's plant of extraordinary visual impact.

Cold limit: USDA 11-12 · RHS H1a (15 to 35°C)

Watch for — Cold damage and leaf drop: Temperatures below 12°C (54°F) cause leaf yellowing and drop; below 10°C (50°F), stem damage can occur. In all but the warmest frost-free climates, grow in a heated glasshouse maintaining a minimum winter temperature of 15°C (59°F).

What new guinea creeper's hardiness rating actually means

New Guinea Creeper 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 H1a means: Tropical — needs a heated room or greenhouse; no frost tolerance whatsoever. On the US scale that maps to USDA 11-12 — 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 above about 15 °C (warm, never cold). New Guinea Creeper has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

Concretely, for new guinea creeper as it gets too cold:

Below about above about 15 °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 new guinea creeper go outside or overwinter — and where?

It can holiday outdoors in summer once nights are reliably above above 15 °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 new guinea creeper can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H1a figure above.

New Guinea Creeper hardiness — frequently asked questions

Is new guinea creeper cold hardy?

New Guinea Creeper 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. New Guinea Creeper can only live outside year-round in genuinely frost-free climates (roughly USDA 11-12); everywhere else it is a houseplant that summers out at most.

What is the minimum temperature new guinea creeper can survive?

Minimum survivable temperature is roughly above about 15 °C (warm, never cold). New Guinea Creeper has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

What hardiness zone is new guinea creeper?

New Guinea Creeper is rated USDA 11-12 and RHS H1a — Tropical — needs a heated room or greenhouse; no frost tolerance whatsoever.

Can new guinea creeper survive winter outside?

It can holiday outdoors in summer once nights are reliably above above 15 °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 new guinea creeper below its minimum temperature?

Below about above about 15 °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.