Cold hardiness & minimum temperature

Is Variegated Elephant Bush (Portulacaria afra 'Variegata')cold hardy? Hardiness zone & min temp

Also called Rainbow Bush, Variegated Spekboom.

More about variegated elephant bush

About Variegated Elephant Bush

Portulacaria afra 'Variegata' · also called Rainbow Bush, Variegated Spekboom · houseplant

Variegated elephant bush is a shrubby South African succulent with reddish stems and small rounded leaves splashed cream and green, often blushing pink at the edges in sun. Slower and more pendulous than the green spekboom, it is a favourite for bonsai and hanging pots. Foliage is widely regarded as non-toxic and even edible.

Cold limit: USDA 9-11 (indoor in most US homes) · RHS H1c (10-27°C)

Watch for — Leaf drop: Sudden shifts in light, watering or temperature, or letting it go too dry, cause leaves to shed. Keep conditions steady and water before the stems shrivel.

What variegated elephant bush's hardiness rating actually means

Variegated 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 H1c means: Warm-temperate — can summer outdoors but must come in well before the first frost. On the US scale that maps to USDA 9-11 (indoor in most US homes) — 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 5 °C (and never frost). Variegated Elephant Bush has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

Concretely, for variegated elephant bush as it gets too cold:

Below about about 5 °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 variegated elephant bush go outside or overwinter — and where?

It can holiday outdoors in summer once nights are reliably above 5 °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 variegated elephant bush can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H1c figure above.

Variegated Elephant Bush hardiness — frequently asked questions

Is variegated elephant bush cold hardy?

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

What is the minimum temperature variegated elephant bush can survive?

Minimum survivable temperature is roughly about 5 °C (and never frost). Variegated Elephant Bush has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

What hardiness zone is variegated elephant bush?

Variegated Elephant Bush is rated USDA 9-11 (indoor in most US homes) and RHS H1c — Warm-temperate — can summer outdoors but must come in well before the first frost.

Can variegated elephant bush survive winter outside?

It can holiday outdoors in summer once nights are reliably above 5 °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 variegated elephant bush below its minimum temperature?

Below about about 5 °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.