Cold hardiness & minimum temperature

Is Entire-Lipped Catasetum (Catasetum integerrimum)cold hardy? Hardiness zone & min temp

Also called Entire-Lipped Catasetum, Intact Catasetum.

More about entire-lipped catasetum

About Entire-Lipped Catasetum

Catasetum integerrimum · also called Entire-Lipped Catasetum, Intact Catasetum · tropical

A vigorous deciduous epiphyte from Mexico through Central America, the Entire-Lipped Catasetum produces striking yellowish-green flowers on pendant spikes in late spring and summer. It demands bright filtered light, heavy feeding and watering during active growth, then a strict dry winter rest once its leaves drop — a cycle that is non-negotiable for reliable flowering.

Cold limit: USDA 11-12 · RHS H1a (15–29°C)

Watch for — Failure to bloom: Catasetum integerrimum requires a pronounced cool, dry winter rest — 6–8 weeks with temperatures around 15–18°C at night and minimal water. Skipping this rest period reliably prevents flowering the following season.

What entire-lipped catasetum's hardiness rating actually means

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

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

Entire-Lipped Catasetum hardiness — frequently asked questions

Is entire-lipped catasetum cold hardy?

Entire-Lipped 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. Entire-Lipped 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 entire-lipped catasetum can survive?

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

What hardiness zone is entire-lipped catasetum?

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

Can entire-lipped 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 entire-lipped 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.