Cold hardiness & minimum temperature

Is Lilyturf-like Primulina (Primulina ophiopogoides)cold hardy? Hardiness zone & min temp

Also called Lilyturf-like Primulina, Mondo Grass Primulina.

More about lilyturf-like primulina

About Lilyturf-like Primulina

Primulina ophiopogoides · also called Lilyturf-like Primulina, Mondo Grass Primulina · houseplant

Primulina ophiopogoides is a distinctive gesneriad from the limestone karst regions of Guangxi, China, named for its unusually narrow, grass-like leaves that resemble those of lilyturf (Ophiopogon). It is adapted to shaded, humid rocky shelves and performs best under dappled or filtered light with consistently moderate moisture. Overwatering is the leading cause of failure; water carefully and ensure the compost never becomes saturated. Not listed by the ASPCA; treat as mildly toxic and keep away from pets.

Cold limit: USDA 10-12 (indoor in most climates) · RHS H1b (13–24°C)

What lilyturf-like primulina's hardiness rating actually means

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

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

Lilyturf-like Primulina hardiness — frequently asked questions

Is lilyturf-like primulina cold hardy?

Lilyturf-like 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. Lilyturf-like 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 lilyturf-like primulina can survive?

What hardiness zone is lilyturf-like primulina?

Lilyturf-like 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 lilyturf-like 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 lilyturf-like 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.