Cold hardiness & minimum temperature

Is Graptophyllum pictum (Graptophyllum pictum)cold hardy? Hardiness zone & min temp

Also called Caricature plant, Graptophyllum.

More about graptophyllum pictum

About Graptophyllum pictum

Graptophyllum pictum · also called Caricature plant, Graptophyllum · tropical

Graptophyllum pictum is a tropical foliage shrub from New Guinea grown for glossy leaves marbled in cream, pink, or yellow, the central blotch suggesting a face. It wants warmth, bright filtered light and evenly moist, fertile soil with good humidity. Brighter light intensifies variegation; it prunes well and roots readily from cuttings.

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

Watch for — Leaf drop and brown tips: Caused by dry air, cold draughts, or inconsistent watering. Stabilise warmth and humidity and keep soil evenly moist.

What graptophyllum pictum's hardiness rating actually means

Graptophyllum pictum 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/greenhouse 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). Graptophyllum pictum has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

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

Graptophyllum pictum hardiness — frequently asked questions

Is graptophyllum pictum cold hardy?

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

What is the minimum temperature graptophyllum pictum can survive?

What hardiness zone is graptophyllum pictum?

Graptophyllum pictum is rated USDA 10-12 (indoor/greenhouse 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 graptophyllum pictum 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 graptophyllum pictum 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.