Cold hardiness & minimum temperature

Is Calathea Fasciata (Round-leaf Calathea) (Goeppertia fasciata)cold hardy? Hardiness zone & min temp

Also called Calathea fasciata.

More about calathea fasciata (round-leaf calathea)

About Calathea Fasciata (Round-leaf Calathea)

Goeppertia fasciata · also called Calathea fasciata · houseplant

Calathea fasciata, the round-leaf calathea, bears large, near-circular pale-green leaves ribbed with deeper-green feathered banding and faintly purple undersides. A prayer plant, its broad leaves fold up at night to reveal the colour beneath. It needs warmth, steady even moisture, high humidity and bright indirect light to look its best indoors.

Cold limit: USDA 11-12 (grown as a houseplant in most of the US) · RHS H1b (18-27°C)

What calathea fasciata (round-leaf calathea)'s hardiness rating actually means

Calathea Fasciata (Round-leaf Calathea) 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 11-12 (grown as a houseplant in most of the US) — 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 (Round-leaf Calathea) has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

Concretely, for calathea fasciata (round-leaf calathea) 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 (round-leaf calathea) 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 (round-leaf calathea) 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 (Round-leaf Calathea) hardiness — frequently asked questions

Is calathea fasciata (round-leaf calathea) cold hardy?

Calathea Fasciata (Round-leaf Calathea) 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 (Round-leaf Calathea) can only live outside year-round in genuinely frost-free climates (roughly USDA 11-12 (grown as a houseplant in most of the US)); everywhere else it is a houseplant that summers out at most.

What is the minimum temperature calathea fasciata (round-leaf calathea) can survive?

What hardiness zone is calathea fasciata (round-leaf calathea)?

Calathea Fasciata (Round-leaf Calathea) is rated USDA 11-12 (grown as a houseplant in most of the US) and RHS H1b — Sub-tropical — a normal warm home is fine, but it cannot go outside in a cool season.

Can calathea fasciata (round-leaf calathea) 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 (round-leaf calathea) 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.