Cold hardiness & minimum temperature

Is Episcia 'Pink Acajou' (Episcia cupreata 'Pink Acajou')cold hardy? Hardiness zone & min temp

Also called Pink Acajou Flame Violet.

More about episcia 'pink acajou'

About Episcia 'Pink Acajou'

Episcia cupreata 'Pink Acajou' · also called Pink Acajou Flame Violet · flowering

Episcia 'Pink Acajou' is a trailing flame violet prized for its coppery-pink, silver-veined quilted leaves as much as its small tubular blooms. A warmth- and humidity-loving gesneriad, it spreads by runners into a low mat, makes a fine hanging or terrarium plant, and resents cold and dryness. ASPCA-listed as non-toxic to cats and dogs.

Cold limit: USDA 11-12 (indoor in most US homes) · RHS H1b (18-27°C)

Watch for — Cold damage and rot: Below about 16°C, or cold-and-wet conditions, the soft tissue blackens and collapses. Keep it warm and ease back on water when cool.

What episcia 'pink acajou''s hardiness rating actually means

Episcia 'Pink Acajou' 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 11-12 (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). Episcia 'Pink Acajou' has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

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

Episcia 'Pink Acajou' hardiness — frequently asked questions

Is episcia 'pink acajou' cold hardy?

Episcia 'Pink Acajou' 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. Episcia 'Pink Acajou' can only live outside year-round in genuinely frost-free climates (roughly USDA 11-12 (indoor in most US homes)); everywhere else it is a houseplant that summers out at most.

What is the minimum temperature episcia 'pink acajou' can survive?

What hardiness zone is episcia 'pink acajou'?

Episcia 'Pink Acajou' is rated USDA 11-12 (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 episcia 'pink acajou' 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 episcia 'pink acajou' 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.