Cold hardiness & minimum temperature

Is Grandidier's Baobab (Adansonia grandidieri)cold hardy? Hardiness zone & min temp

Also called Grandidier's Baobab, Giant Baobab, Madagascar Baobab.

More about grandidier's baobab

About Grandidier's Baobab

Adansonia grandidieri · also called Grandidier's Baobab, Giant Baobab · tropical

The tallest and most iconic of Madagascar's six endemic baobab species, forming towering cylindrical trunks up to 25 m high. Critically endangered in the wild. Slower-growing than A. digitata; requires full sun, a very long dry rest, and temperatures that never dip below 10°C. Prized as a specimen container plant.

Cold limit: USDA 10–11 · RHS H1b (15–35°C)

Watch for — Cold stress: Temperatures below 10°C slow growth markedly and below 5°C may kill young specimens even if kept dry. Provide a heated greenhouse or a bright, warm indoor position in winter.

What grandidier's baobab's hardiness rating actually means

Grandidier's Baobab 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 10–11 — 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). Grandidier's Baobab has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

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

Grandidier's Baobab hardiness — frequently asked questions

Is grandidier's baobab cold hardy?

Grandidier's Baobab 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. Grandidier's Baobab can only live outside year-round in genuinely frost-free climates (roughly USDA 10–11); everywhere else it is a houseplant that summers out at most.

What is the minimum temperature grandidier's baobab can survive?

What hardiness zone is grandidier's baobab?

Grandidier's Baobab is rated USDA 10–11 and RHS H1b — Sub-tropical — a normal warm home is fine, but it cannot go outside in a cool season.

Can grandidier's baobab 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 grandidier's baobab 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.