Cold hardiness & minimum temperature

Is Kaurima Pyrenacantha (Pyrenacantha kaurabassana)cold hardy? Hardiness zone & min temp

Also called Kaurima Pyrenacantha.

More about kaurima pyrenacantha

About Kaurima Pyrenacantha

Pyrenacantha kaurabassana · also called Kaurima Pyrenacantha · houseplant

A caudiciform geophyte from eastern and southern Africa (Icacinaceae) grown for its sculptural subterranean tuber and scrambling vines. Keep in bright indirect light, water moderately in summer and sparingly in winter, and use an exceptionally free-draining mineral mix. Ideal for collectors of unusual caudex plants.

Cold limit: USDA 10–12 · RHS H1b (15–30°C)

Watch for — Vine dieback in winter: The aerial stems naturally die back during cool or dry dormancy. This is normal; do not discard the plant. Resume watering in spring and new shoots will emerge from the caudex.

What kaurima pyrenacantha's hardiness rating actually means

Kaurima Pyrenacantha 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). Kaurima Pyrenacantha has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

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

Kaurima Pyrenacantha hardiness — frequently asked questions

Is kaurima pyrenacantha cold hardy?

Kaurima Pyrenacantha 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. Kaurima Pyrenacantha 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 kaurima pyrenacantha can survive?

What hardiness zone is kaurima pyrenacantha?

Kaurima Pyrenacantha 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 kaurima pyrenacantha 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 kaurima pyrenacantha 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.