Cold hardiness & minimum temperature

Is Cupuaçu (Theobroma grandiflorum)cold hardy? Hardiness zone & min temp

Also called Cupuaçu, Cupuassu, Copoazu.

More about cupuaçu

About Cupuaçu

Theobroma grandiflorum · also called Cupuaçu, Cupuassu · tropical

Cupuaçu (Theobroma grandiflorum) is an Amazonian understorey tree and close relative of cacao, grown for large fragrant pods with creamy, aromatic pulp. It is an understorey species that prefers dappled light when young, constant warmth, very high humidity and rich, moist, well-drained soil. It is a demanding true-tropics tree, unsuited to dry indoor air.

Cold limit: USDA 11-12 (true tropics; greenhouse only elsewhere) · RHS H1a (22-32°C)

Watch for — Cold injury: Highly frost-tender; damage occurs below about 10-13°C. Keep consistently warm and never expose to cold drafts or frost.

What cupuaçu's hardiness rating actually means

Cupuaçu 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 (true tropics; greenhouse only elsewhere) — 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). Cupuaçu has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

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

Cupuaçu hardiness — frequently asked questions

Is cupuaçu cold hardy?

Cupuaçu 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. Cupuaçu can only live outside year-round in genuinely frost-free climates (roughly USDA 11-12 (true tropics; greenhouse only elsewhere)); everywhere else it is a houseplant that summers out at most.

What is the minimum temperature cupuaçu can survive?

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

What hardiness zone is cupuaçu?

Cupuaçu is rated USDA 11-12 (true tropics; greenhouse only elsewhere) and RHS H1a — Tropical — needs a heated room or greenhouse; no frost tolerance whatsoever.

Can cupuaçu 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 cupuaçu 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.