Cold hardiness & minimum temperature

Is Green-Yellow Catasetum (Catasetum viridiflavum)cold hardy? Hardiness zone & min temp

Also called Green-Yellow Catasetum.

More about green-yellow catasetum

About Green-Yellow Catasetum

Catasetum viridiflavum · also called Green-Yellow Catasetum · tropical

Found in hot lowlands from Honduras to Peru, the Green-Yellow Catasetum is a large, sun-loving deciduous epiphyte known for its sexually dimorphic flowers — bright, large male blooms versus smaller, yellowish-green female flowers. It demands high light, copious water and fertiliser during growth, then a hard dry rest once its large deciduous leaves drop.

Cold limit: USDA 11-12 · RHS H1a (18–35°C)

Watch for — Root rot from wet winter rest: Any residual moisture during the leafless dormancy period rapidly causes root and rhizome rot. The medium should remain completely dry — do not water at all until new growth is visibly emerging in spring.

What green-yellow catasetum's hardiness rating actually means

Green-Yellow Catasetum 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). Green-Yellow Catasetum has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

Concretely, for green-yellow catasetum 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 green-yellow catasetum 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 green-yellow catasetum can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H1a figure above.

Green-Yellow Catasetum hardiness — frequently asked questions

Is green-yellow catasetum cold hardy?

Green-Yellow Catasetum 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. Green-Yellow Catasetum 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 green-yellow catasetum can survive?

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

What hardiness zone is green-yellow catasetum?

Green-Yellow Catasetum is rated USDA 11-12 and RHS H1a — Tropical — needs a heated room or greenhouse; no frost tolerance whatsoever.

Can green-yellow catasetum 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 green-yellow catasetum 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.