Cold hardiness & minimum temperature

Is Alocasia Cuprea Red Secret (Alocasia cuprea 'Red Secret')cold hardy? Hardiness zone & min temp

Also called Mirror Plant, Red Secret.

More about alocasia cuprea red secret

About Alocasia Cuprea Red Secret

Alocasia cuprea 'Red Secret' · also called Mirror Plant, Red Secret · tropical

Alocasia Cuprea 'Red Secret' is a compact jewel Alocasia with thick, puckered leaves of metallic coppery-red flushed with deep green and purple undersides. The reflective sheen earns it the nickname mirror plant. A small but demanding tropical aroid, it craves warmth, high humidity and an airy, fast-draining mix, and resents both drought and sogginess.

Cold limit: USDA 10-12 (indoor in most US homes) · RHS H1b (18-28°C)

Watch for — Yellowing and leaf drop: Overwatering, cold or natural dormancy causes leaves to yellow and fall; ease off water, keep warm, and trust the rhizome to regrow.

What alocasia cuprea red secret's hardiness rating actually means

Alocasia Cuprea Red Secret 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). Alocasia Cuprea Red Secret has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

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

Alocasia Cuprea Red Secret hardiness — frequently asked questions

Is alocasia cuprea red secret cold hardy?

Alocasia Cuprea Red Secret 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. Alocasia Cuprea Red Secret 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 alocasia cuprea red secret can survive?

What hardiness zone is alocasia cuprea red secret?

Alocasia Cuprea Red Secret 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 alocasia cuprea red secret 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 alocasia cuprea red secret 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.