Cold hardiness & minimum temperature

Is Glorious Columnea (Columnea gloriosa)cold hardy? Hardiness zone & min temp

Also called Glorious Columnea, Goldfish Plant, Flying Goldfish Plant.

More about glorious columnea

About Glorious Columnea

Columnea gloriosa · also called Glorious Columnea, Goldfish Plant · tropical

Columnea gloriosa is the most widely cultivated species in the genus and is native to the rainforests of Costa Rica and Central America, where it grows as an epiphyte draped over tree branches. It produces a prolific cascade of vivid orange-red tubular flowers, each resembling a leaping goldfish, along stems densely clad in hairy dark-green leaves. It thrives in high humidity with bright indirect light and an open, free-draining epiphytic mix — overwatering is the most common cause of failure. According to the ASPCA, Columnea is non-toxic to cats and dogs.

Cold limit: USDA 10-12 (indoor in most climates) · RHS H1b (18–27 °C)

What glorious columnea's hardiness rating actually means

Glorious Columnea 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 (indoor in most climates) — 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). Glorious Columnea has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

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

Glorious Columnea hardiness — frequently asked questions

Is glorious columnea cold hardy?

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

What is the minimum temperature glorious columnea can survive?

What hardiness zone is glorious columnea?

Glorious Columnea is rated USDA 10-12 (indoor in most climates) and RHS H1b — Sub-tropical — a normal warm home is fine, but it cannot go outside in a cool season.

Can glorious columnea 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 glorious columnea 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.