Cold hardiness & minimum temperature

Is Candelabra Euphorbia (Euphorbia candelabrum)cold hardy? Hardiness zone & min temp

Also called candelabra tree, African candelabra.

More about candelabra euphorbia

About Candelabra Euphorbia

Euphorbia candelabrum · also called candelabra tree, African candelabra · houseplant

Candelabra Euphorbia is a large, columnar succulent spurge from East Africa whose ribbed, branching arms mimic a true cactus. Grown indoors as a bold architectural specimen, it needs bright light, gritty soil and infrequent watering. Its copious milky latex is highly irritating to skin, eyes and pets, so handle it with real care.

Cold limit: USDA 10-11 (indoor in most US homes) · RHS H1b (16-30°C)

Watch for — Cold and corky damage: Temperatures below about 10°C cause soft, discoloured patches. Keep it warm and away from draughty windows in winter.

What candelabra euphorbia's hardiness rating actually means

Candelabra Euphorbia 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 (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 10 °C (sustained cold below this is damaging). Candelabra Euphorbia has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

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

Candelabra Euphorbia hardiness — frequently asked questions

Is candelabra euphorbia cold hardy?

Candelabra Euphorbia 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. Candelabra Euphorbia can only live outside year-round in genuinely frost-free climates (roughly USDA 10-11 (indoor in most US homes)); everywhere else it is a houseplant that summers out at most.

What is the minimum temperature candelabra euphorbia can survive?

What hardiness zone is candelabra euphorbia?

Candelabra Euphorbia is rated USDA 10-11 (indoor in most US homes) and RHS H1b — Sub-tropical — a normal warm home is fine, but it cannot go outside in a cool season.

Can candelabra euphorbia 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 candelabra euphorbia 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.