Cold hardiness & minimum temperature

Is Calathea orbifolia (Goeppertia orbifolia (syn. Calathea orbifolia))cold hardy? Hardiness zone & min temp

Also called Round-leaved calathea, Orbifolia prayer plant, Calathea orbifolia.

More about calathea orbifolia

About Calathea orbifolia

Goeppertia orbifolia (syn. Calathea orbifolia) · also called Round-leaved calathea, Orbifolia prayer plant · tropical

Calathea orbifolia is a Bolivian rainforest perennial in the prayer-plant family, prized for large, near-round leaves striped silvery-blue and green. Its defining care need is steady moisture without sogginess, paired with high humidity and filtered or rainwater, as it is intolerant of the fluoride and chlorine in ordinary tap water.

Cold limit: 18-27°C

Watch for — Yellowing leaves and rot: Soggy, waterlogged compost and cold, draughty positions lead to yellowing lower leaves and root rot. Use a free-draining mix, empty saucers after watering, and keep the plant above 16°C away from cold draughts.

What calathea orbifolia's hardiness rating actually means

Calathea orbifolia 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 H1a means: Tropical — needs a heated room or greenhouse; no frost tolerance whatsoever. On the US scale that maps to USDA not formally rated (treat as tender) — 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 above about 15 °C (warm, never cold). Calathea orbifolia has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

Concretely, for calathea orbifolia as it gets too cold:

Below about above about 15 °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 calathea orbifolia go outside or overwinter — and where?

It can holiday outdoors in summer once nights are reliably above above 15 °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 calathea orbifolia can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H1a figure above.

Calathea orbifolia hardiness — frequently asked questions

Is calathea orbifolia cold hardy?

Calathea orbifolia 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. Calathea orbifolia can only live outside year-round in genuinely frost-free climates (roughly USDA not formally rated (treat as tender)); everywhere else it is a houseplant that summers out at most.

What is the minimum temperature calathea orbifolia can survive?

Minimum survivable temperature is roughly above about 15 °C (warm, never cold). Calathea orbifolia has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

What hardiness zone is calathea orbifolia?

Calathea orbifolia is rated USDA not formally rated (treat as tender) and RHS H1a — Tropical — needs a heated room or greenhouse; no frost tolerance whatsoever.

Can calathea orbifolia survive winter outside?

It can holiday outdoors in summer once nights are reliably above above 15 °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 calathea orbifolia below its minimum temperature?

Below about above about 15 °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.