Cold hardiness & minimum temperature

Is Bolivian Columnea (Columnea boliviensis)cold hardy? Hardiness zone & min temp

Also called Bolivian Columnea, Goldfish Plant.

More about bolivian columnea

About Bolivian Columnea

Columnea boliviensis · also called Bolivian Columnea, Goldfish Plant · tropical

Columnea boliviensis is a trailing epiphytic subshrub from the Andean cloud forests of Bolivia and adjacent South America, where the genus reaches the southern edge of its range. Like other Columneas, it bears brilliantly coloured tubular flowers adapted for hummingbird pollination and demands warm, humid conditions with an open, fast-draining growing medium. High humidity is the most critical factor — stems wilt and fail to flower when the air dries below 50%. According to the ASPCA, Columnea is non-toxic to cats and dogs.

Cold limit: USDA 10-12 (indoor in most climates) · RHS H1b (16–24 °C)

Watch for — Failure to flower: Most commonly caused by insufficient light or overly high winter temperatures; a brief cool period (around 16 °C) combined with reduced watering in winter encourages the next flush of blooms.

What bolivian columnea's hardiness rating actually means

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

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

Bolivian Columnea hardiness — frequently asked questions

Is bolivian columnea cold hardy?

Bolivian 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. Bolivian 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 bolivian columnea can survive?

What hardiness zone is bolivian columnea?

Bolivian 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 bolivian 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 bolivian 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.