Cold hardiness & minimum temperature

Is Elephant Ear Staghorn Fern (Platycerium elephantotis)cold hardy? Hardiness zone & min temp

Also called Elephant Ear Staghorn Fern, Angola Staghorn.

More about elephant ear staghorn fern

About Elephant Ear Staghorn Fern

Platycerium elephantotis · also called Elephant Ear Staghorn Fern, Angola Staghorn · houseplant

Platycerium elephantotis, from tropical Africa, is the staghorn that breaks the antler mould: its broad, rounded, undivided fertile fronds look like elephant ears rather than horns, paired with wavy upright shield fronds. An epiphyte grown mounted or in a basket, it likes warmth, bright indirect light, good airflow, and a soak-and-dry watering cycle.

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

What elephant ear staghorn fern's hardiness rating actually means

Elephant Ear Staghorn 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). Elephant Ear Staghorn Fern has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

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

Elephant Ear Staghorn Fern hardiness — frequently asked questions

Is elephant ear staghorn fern cold hardy?

Elephant Ear Staghorn 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. Elephant Ear Staghorn 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 elephant ear staghorn fern can survive?

What hardiness zone is elephant ear staghorn fern?

Elephant Ear Staghorn 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 elephant ear staghorn 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 elephant ear staghorn 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.