Cold hardiness & minimum temperature

Is Puerto Rican Columnea (Columnea tulae)cold hardy? Hardiness zone & min temp

Also called Puerto Rican Columnea, Tibey Parásito.

More about puerto rican columnea

About Puerto Rican Columnea

Columnea tulae · also called Puerto Rican Columnea, Tibey Parásito · tropical

An epiphytic gesneriad endemic to the mountainous forests of Puerto Rico and Hispaniola, producing bright yellow tubular flowers almost year-round against small, dark-green, hairy leaves. It is a compact, trailing species well-suited to hanging baskets. It requires warm, humid conditions, bright indirect light, and a fast-draining mix to flower freely indoors.

Cold limit: USDA 11-12 · RHS H1a (15 to 27°C)

Watch for — Sparse flowering in low light: This species flowers nearly year-round given sufficient light. If blooming stops or slows, move to a brighter (indirect) position. Supplemental grow-light in winter can maintain consistent flowering in lower-light interiors.

What puerto rican columnea's hardiness rating actually means

Puerto Rican 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 H1a means: Tropical — needs a heated room or greenhouse; no frost tolerance whatsoever. On the US scale that maps to USDA 11-12 — 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). Puerto Rican Columnea has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

Concretely, for puerto rican columnea 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 puerto rican columnea 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 puerto rican columnea can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H1a figure above.

Puerto Rican Columnea hardiness — frequently asked questions

Is puerto rican columnea cold hardy?

Puerto Rican 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. Puerto Rican Columnea can only live outside year-round in genuinely frost-free climates (roughly USDA 11-12); everywhere else it is a houseplant that summers out at most.

What is the minimum temperature puerto rican columnea can survive?

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

What hardiness zone is puerto rican columnea?

Puerto Rican Columnea is rated USDA 11-12 and RHS H1a — Tropical — needs a heated room or greenhouse; no frost tolerance whatsoever.

Can puerto rican columnea 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 puerto rican columnea 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.