Cold hardiness & minimum temperature

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

Also called Calathea fasciata, Goeppertia fasciata, Prayer plant (fasciata).

More about calathea fasciata

About Calathea Fasciata

Goeppertia fasciata (syn. Calathea fasciata) · also called Calathea fasciata, Goeppertia fasciata · houseplant

Calathea fasciata (Goeppertia fasciata) is a compact prayer plant from Brazilian rainforests, prized for rounded deep-green leaves with pale striping and purple undersides. It wants bright indirect light, evenly moist soil with filtered or rainwater, and 50 percent-plus humidity. It is treated as pet-safe: not individually ASPCA-listed, but its genus is non-toxic.

Cold limit: USDA 10a-11b (grown as a houseplant elsewhere) (18-29C)

What calathea fasciata's hardiness rating actually means

Calathea Fasciata 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 10a-11b (grown as a houseplant elsewhere) — 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). Calathea Fasciata has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

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

Calathea Fasciata hardiness — frequently asked questions

Is calathea fasciata cold hardy?

Calathea Fasciata 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 Fasciata can only live outside year-round in genuinely frost-free climates (roughly USDA 10a-11b (grown as a houseplant elsewhere)); everywhere else it is a houseplant that summers out at most.

What is the minimum temperature calathea fasciata can survive?

What hardiness zone is calathea fasciata?

Calathea Fasciata is rated USDA 10a-11b (grown as a houseplant elsewhere) and RHS H1b — Sub-tropical — a normal warm home is fine, but it cannot go outside in a cool season.

Can calathea fasciata 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 calathea fasciata 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.