Cold hardiness & minimum temperature

Is Pinnate Primulina (Primulina pinnatifida)cold hardy? Hardiness zone & min temp

Also called Pinnate Primulina, Pinnate Chirita.

More about pinnate primulina

About Pinnate Primulina

Primulina pinnatifida · also called Pinnate Primulina, Pinnate Chirita · houseplant

Primulina pinnatifida is a compact gesneriad native to limestone karst habitats in southern China, where it grows in shaded rock crevices at moderate elevations. Like all Primulinas it needs bright indirect light with no direct sun, evenly moist but never waterlogged soil, and moderate to high humidity. The single most important care fact is to keep water off its velvety leaves, which trap moisture and quickly develop rot spots. Primulina pinnatifida is not listed on the ASPCA toxic plant database; the Gesneriaceae family is broadly considered non-toxic, though keep pets from nibbling to avoid mild gastric upset.

Cold limit: USDA 10-12 (indoor in most climates) · RHS H1b (15–25°C)

What pinnate primulina's hardiness rating actually means

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

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

Pinnate Primulina hardiness — frequently asked questions

Is pinnate primulina cold hardy?

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

What is the minimum temperature pinnate primulina can survive?

What hardiness zone is pinnate primulina?

Pinnate Primulina is rated USDA 10-12 (indoor in most climates) and RHS H1b — Sub-tropical — a normal warm home is fine, but it cannot go outside in a cool season.

Can pinnate primulina 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 pinnate primulina 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.