Cold hardiness & minimum temperature

Is Elephant bush (Portulacaria afra)cold hardy? Hardiness zone & min temp

Also called Elephant bush, Elephant's food, Porkbush, Dwarf jade, Spekboom.

More about elephant bush

About Elephant bush

Portulacaria afra · also called Elephant bush, Elephant's food · houseplant

Elephant bush (Portulacaria afra) is an easy-going South African succulent shrub with glossy, coin-sized leaves on red-brown stems, often grown as an indoor mini-tree or bonsai. Its one defining need is sharp drainage: plant it in gritty cactus compost and let the soil dry between waterings, because soggy roots rot it fast.

Cold limit: USDA 9-11 · RHS H1b (10-15°C minimum; grow under glass or as a houseplant, stand outdoors only in summer) (18-27°C)

Watch for — Root rot from overwatering: By far the most common problem: soggy compost causes blackening, mushy stems and sudden collapse. Always let the mix dry out, use gritty soil and a pot with drainage holes, and water less in winter.

What elephant bush's hardiness rating actually means

Elephant bush 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 9-11 — 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). Elephant bush has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

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

Elephant bush hardiness — frequently asked questions

Is elephant bush cold hardy?

Elephant bush 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. Elephant bush can only live outside year-round in genuinely frost-free climates (roughly USDA 9-11); everywhere else it is a houseplant that summers out at most.

What is the minimum temperature elephant bush can survive?

What hardiness zone is elephant bush?

Elephant bush is rated USDA 9-11 and RHS H1b — Sub-tropical — a normal warm home is fine, but it cannot go outside in a cool season.

Can elephant bush 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 elephant bush 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.