Cold hardiness & minimum temperature

Is Painted Caladium (Caladium picturatum)cold hardy? Hardiness zone & min temp

Also called Picture Caladium, Lance-Leaved Caladium, Pointed-Leaf Caladium.

More about painted caladium

About Painted Caladium

Caladium picturatum · also called Picture Caladium, Lance-Leaved Caladium · tropical

Caladium picturatum is a tropical Araceae known for its lance-shaped, vividly patterned leaves with contrasting veins and speckled midribs in shades of white, pink, and green. It goes dormant in cooler months. Like all caladiums, it is toxic to pets and humans due to insoluble calcium oxalate crystals throughout its tissues.

Cold limit: USDA 10-11 · RHS H1c (20-30°C)

Watch for — Root and tuber rot: Occurs in cold, wet soil. Maintain warm temperatures and ensure the potting mix is free-draining.

What painted caladium's hardiness rating actually means

Painted Caladium 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 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 5 °C (and never frost). Painted Caladium has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

Concretely, for painted caladium 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 painted caladium 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 painted caladium can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H1c figure above.

Painted Caladium hardiness — frequently asked questions

Is painted caladium cold hardy?

Painted Caladium 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. Painted Caladium 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 painted caladium can survive?

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

What hardiness zone is painted caladium?

Painted Caladium is rated USDA 10-11 and RHS H1c — Warm-temperate — can summer outdoors but must come in well before the first frost.

Can painted caladium 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 painted caladium 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.