Cold hardiness & minimum temperature

Is Silver Dollar Maidenhair Fern (Adiantum peruvianum)cold hardy? Hardiness zone & min temp

Also called Silver Dollar Maidenhair Fern, Peruvian Maidenhair.

More about silver dollar maidenhair fern

About Silver Dollar Maidenhair Fern

Adiantum peruvianum · also called Silver Dollar Maidenhair Fern, Peruvian Maidenhair · houseplant

Adiantum peruvianum is a striking large-leaved maidenhair fern from Peru and Bolivia, producing broad, silvery-green to rose-tinted pinnules on wiry black stems — far bolder than most maidenhair ferns. It demands consistently high humidity, consistent moisture, and bright indirect light. A rewarding challenge for dedicated fern enthusiasts seeking something dramatic.

Cold limit: USDA 10-12 · RHS H1b (16–26°C)

Watch for — New fronds emerging but dying before maturity: Caused by low humidity during frond unfurling — the delicate croziers desiccate before they harden. Increase humidity to above 65%, ensure no draughts reach the plant, and avoid misting directly on croziers (which can cause rot). A humidity dome over new growth helps.

What silver dollar maidenhair fern's hardiness rating actually means

Silver Dollar Maidenhair 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 — 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). Silver Dollar Maidenhair Fern has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

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

Silver Dollar Maidenhair Fern hardiness — frequently asked questions

Is silver dollar maidenhair fern cold hardy?

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

What is the minimum temperature silver dollar maidenhair fern can survive?

What hardiness zone is silver dollar maidenhair fern?

Silver Dollar Maidenhair Fern is rated USDA 10-12 and RHS H1b — Sub-tropical — a normal warm home is fine, but it cannot go outside in a cool season.

Can silver dollar maidenhair 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 silver dollar maidenhair 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.