Cold hardiness & minimum temperature

Is Oakleaf Croton (Codiaeum variegatum 'Oakleaf')cold hardy? Hardiness zone & min temp

Also called oakleaf croton, oak-leaf croton.

More about oakleaf croton

About Oakleaf Croton

Codiaeum variegatum 'Oakleaf' · also called oakleaf croton, oak-leaf croton · tropical

'Oakleaf' croton is named for its lobed, oak-shaped leaves in deep green with bold yellow, orange, and red veins. The thick, sculptural foliage gives it an autumnal look year-round. As with all crotons it demands bright light, steady warmth, and humidity to colour up and stay full, and reacts to cold drafts, dryness, or relocation by dropping leaves.

Cold limit: USDA 10-12 (indoor in most US homes) · RHS H1b (18-29°C)

Watch for — Leaf drop: Triggered by moving the plant, cold drafts, low temperatures, or drought. Keep conditions stable and the soil evenly moist to minimise shedding.

What oakleaf croton's hardiness rating actually means

Oakleaf Croton 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 10-12 (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). Oakleaf Croton has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

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

Oakleaf Croton hardiness — frequently asked questions

Is oakleaf croton cold hardy?

Oakleaf Croton 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. Oakleaf Croton can only live outside year-round in genuinely frost-free climates (roughly USDA 10-12 (indoor in most US homes)); everywhere else it is a houseplant that summers out at most.

What is the minimum temperature oakleaf croton can survive?

What hardiness zone is oakleaf croton?

Oakleaf Croton is rated USDA 10-12 (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 oakleaf croton 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 oakleaf croton 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.