Cold hardiness & minimum temperature

Is Oak Leaf Fern (Drynaria quercifolia)cold hardy? Hardiness zone & min temp

Also called Oak Leaf Fern, Basket Fern.

More about oak leaf fern

About Oak Leaf Fern

Drynaria quercifolia · also called Oak Leaf Fern, Basket Fern · houseplant

Drynaria quercifolia is a large epiphytic basket fern from tropical Asia and Australia with two frond types: persistent brown, oak-leaf-shaped nest fronds that collect litter into a humus basket, and big, glossy green foliage fronds. It grows on trees and rocks, so it suits baskets and mounts, wanting bright indirect light, warmth, humidity, and a soak-and-dry routine.

Cold limit: USDA 10-12 outdoors; houseplant in cooler zones · RHS H1b (18-28°C)

Watch for — Slow or stunted growth: Too cold or too dark. Provide warmth above 18°C and bright, indirect light.

What oak leaf fern's hardiness rating actually means

Oak Leaf 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 10-12 outdoors; houseplant in cooler zones — 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). Oak Leaf Fern has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

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

Oak Leaf Fern hardiness — frequently asked questions

Is oak leaf fern cold hardy?

Oak Leaf 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. Oak Leaf Fern can only live outside year-round in genuinely frost-free climates (roughly USDA 10-12 outdoors; houseplant in cooler zones); everywhere else it is a houseplant that summers out at most.

What is the minimum temperature oak leaf fern can survive?

What hardiness zone is oak leaf fern?

Oak Leaf Fern is rated USDA 10-12 outdoors; houseplant in cooler zones and RHS H1b — Sub-tropical — a normal warm home is fine, but it cannot go outside in a cool season.

Can oak leaf 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 oak leaf 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.