Cold hardiness & minimum temperature

Is Soursop (Annona muricata)cold hardy? Hardiness zone & min temp

Also called Soursop, Guanábana, Graviola.

More about soursop

About Soursop

Annona muricata · also called Soursop, Guanábana · tropical

Soursop is a tropical evergreen tree bearing large, spiny green fruit with tangy, creamy white pulp. The most heat-loving and frost-tender of the common Annonas, it needs consistent warmth, humidity, and well-drained soil. It fruits relatively young but cannot tolerate cold, so it is grown under glass outside the tropics.

Cold limit: USDA 10b-11 (very frost-tender; damaged below about 5°C) · RHS H1b (20-30°C)

Watch for — Cold damage: The most cold-sensitive common Annona; chilling below about 5°C damages leaves and growth, and any frost can be fatal. Keep it reliably warm.

What soursop's hardiness rating actually means

Soursop 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 10b-11 (very frost-tender; damaged below about 5°C) — 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). Soursop has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

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

Soursop hardiness — frequently asked questions

Is soursop cold hardy?

Soursop 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. Soursop can only live outside year-round in genuinely frost-free climates (roughly USDA 10b-11 (very frost-tender; damaged below about 5°C)); everywhere else it is a houseplant that summers out at most.

What is the minimum temperature soursop can survive?

Minimum survivable temperature is roughly about 10 °C (sustained cold below this is damaging). Soursop has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

What hardiness zone is soursop?

Soursop is rated USDA 10b-11 (very frost-tender; damaged below about 5°C) and RHS H1b — Sub-tropical — a normal warm home is fine, but it cannot go outside in a cool season.

Can soursop 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 soursop 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.