Cold hardiness & minimum temperature

Is Cretan Brake Fern (Pteris cretica)cold hardy? Hardiness zone & min temp

Also called Cretan Brake Fern, Ribbon Fern, Table Fern.

More about cretan brake fern

About Cretan Brake Fern

Pteris cretica · also called Cretan Brake Fern, Ribbon Fern · houseplant

A compact, elegant fern producing erect, pinnate fronds with strap-like leaflets in plain green or variegated forms. Widely sold as a houseplant for its tolerance of lower light conditions and modest size. Needs consistent moisture and moderate humidity, making it a reliable choice for bathrooms or humid kitchens. Grows tidily to around 45–60 cm tall.

Cold limit: USDA 8–10 · RHS H1b (13–24°C)

What cretan brake fern's hardiness rating actually means

Cretan Brake Fern 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 8–10 — 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). Cretan Brake Fern has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

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

Cretan Brake Fern hardiness — frequently asked questions

Is cretan brake fern cold hardy?

Cretan Brake Fern 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. Cretan Brake Fern can only live outside year-round in genuinely frost-free climates (roughly USDA 8–10); everywhere else it is a houseplant that summers out at most.

What is the minimum temperature cretan brake fern can survive?

What hardiness zone is cretan brake fern?

Cretan Brake Fern is rated USDA 8–10 and RHS H1b — Sub-tropical — a normal warm home is fine, but it cannot go outside in a cool season.

Can cretan brake fern 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 cretan brake fern 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.