Cold hardiness & minimum temperature

Is Pilea microphylla 'Variegata' (Pilea microphylla 'Variegata')cold hardy? Hardiness zone & min temp

Also called variegated artillery plant, variegated rockweed.

More about pilea microphylla 'variegata'

About Pilea microphylla 'Variegata'

Pilea microphylla 'Variegata' · also called variegated artillery plant, variegated rockweed · houseplant

Pilea microphylla 'Variegata' is the variegated artillery plant, a fine-textured bushy pilea with tiny ferny leaves splashed cream, pink and green. Named for the way it flicks pollen, it enjoys bright indirect light, warmth and lightly moist, free-draining soil. Compact and easy to grow. ASPCA-listed as non-toxic to cats and dogs.

Cold limit: USDA 10-12 (indoor; can naturalise outdoors in zones 10-11) · RHS H1b (16-26°C)

What pilea microphylla 'variegata''s hardiness rating actually means

Pilea microphylla 'Variegata' 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; can naturalise outdoors in zones 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 10 °C (sustained cold below this is damaging). Pilea microphylla 'Variegata' has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

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

Pilea microphylla 'Variegata' hardiness — frequently asked questions

Is pilea microphylla 'variegata' cold hardy?

Pilea microphylla 'Variegata' 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. Pilea microphylla 'Variegata' can only live outside year-round in genuinely frost-free climates (roughly USDA 10-12 (indoor; can naturalise outdoors in zones 10-11)); everywhere else it is a houseplant that summers out at most.

What is the minimum temperature pilea microphylla 'variegata' can survive?

What hardiness zone is pilea microphylla 'variegata'?

Pilea microphylla 'Variegata' is rated USDA 10-12 (indoor; can naturalise outdoors in zones 10-11) and RHS H1b — Sub-tropical — a normal warm home is fine, but it cannot go outside in a cool season.

Can pilea microphylla 'variegata' 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 pilea microphylla 'variegata' 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.