Cold hardiness & minimum temperature

Is Primulina (Chirita) (Primulina tabacum)cold hardy? Hardiness zone & min temp

Also called Primulina, Chirita, Vietnamese violet, Chinese cave plant.

More about primulina (chirita)

About Primulina (Chirita)

Primulina tabacum · also called Primulina, Chirita · houseplant

Primulina (formerly Chirita) is a compact, rosette-forming Gesneriad and an African-violet relative from the limestone hills of China and Vietnam. It thrives in bright indirect light with slightly-dry, airy soil and tepid water. Easy and long-blooming, it suits windowsills and small spaces. Not individually ASPCA-listed; keep it away from curious pets.

Cold limit: USDA Grown as a houseplant; hardy outdoors only in USDA zones 11-12 (frost-tender). (16-27 C)

Watch for — Pale spots and rings on leaves: Caused by watering with cold water or splashing water on the foliage. Always use tepid, room-temperature water and water at the soil level, not over the leaves.

What primulina (chirita)'s hardiness rating actually means

Primulina (Chirita) 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 Grown as a houseplant; hardy outdoors only in USDA zones 11-12 (frost-tender). — 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). Primulina (Chirita) has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

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

Primulina (Chirita) hardiness — frequently asked questions

Is primulina (chirita) cold hardy?

Primulina (Chirita) 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. Primulina (Chirita) can only live outside year-round in genuinely frost-free climates (roughly USDA Grown as a houseplant; hardy outdoors only in USDA zones 11-12 (frost-tender).); everywhere else it is a houseplant that summers out at most.

What is the minimum temperature primulina (chirita) can survive?

What hardiness zone is primulina (chirita)?

Primulina (Chirita) is rated USDA Grown as a houseplant; hardy outdoors only in USDA zones 11-12 (frost-tender). and RHS H1b — Sub-tropical — a normal warm home is fine, but it cannot go outside in a cool season.

Can primulina (chirita) 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 primulina (chirita) 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.