Cold hardiness & minimum temperature

Is Panama Queen (Aphelandra sinclairiana)cold hardy? Hardiness zone & min temp

Also called Panama Queen, Coral Aphelandra, Orange Shrimp Plant, Sinclair's Aphelandra.

More about panama queen

About Panama Queen

Aphelandra sinclairiana · also called Panama Queen, Coral Aphelandra · tropical

A spectacular large tropical shrub native to Panama, Costa Rica, and Nicaragua, producing dramatic spikes of vivid coral-orange bracts with fragrant pink tubular flowers beloved by hummingbirds. Growing to 3 m outdoors in frost-free climates, it makes a bold container specimen in temperate zones when given warmth, filtered light, and consistent moisture.

Cold limit: USDA 10-11 · RHS H1b (18–27°C (min. 4–7°C for short periods only))

Watch for — Leaf yellowing and drop in cold conditions: Aphelandra sinclairiana is frost-sensitive and suffers leaf drop when temperatures fall below 10°C or when exposed to cold draughts. In temperate climates, bring container-grown plants indoors before first frost, keeping them in a bright, frost-free room above 10°C through winter.

What panama queen's hardiness rating actually means

Panama Queen 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 10-11 — 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). Panama Queen has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

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

Panama Queen hardiness — frequently asked questions

Is panama queen cold hardy?

Panama Queen 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. Panama Queen 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 panama queen can survive?

Minimum survivable temperature is roughly about 10 °C (sustained cold below this is damaging). Panama Queen has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

What hardiness zone is panama queen?

Panama Queen is rated USDA 10-11 and RHS H1b — Sub-tropical — a normal warm home is fine, but it cannot go outside in a cool season.

Can panama queen 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 panama queen 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.