Cold hardiness & minimum temperature

Is Skinners Achimenes (Achimenes skinneri)cold hardy? Hardiness zone & min temp

Also called Skinner's Achimenes, Skinners Achimenes.

More about skinners achimenes

About Skinners Achimenes

Achimenes skinneri · also called Skinner's Achimenes, Skinners Achimenes · flowering

Achimenes skinneri is a robust, upright magic flower native to damp thickets and forest edges from southern Mexico through Central America to Costa Rica. It produces striking pink-to-magenta tubular flowers with yellow throats on large, coarse, heavily serrated leaves. One of the tallest and most vigorous species, it may need staking at full bloom and is a heavy feeder during summer.

Cold limit: USDA 10–12 · RHS H1b (18–25°C active growth; 13–15°C winter storage)

Watch for — Brown leaf margins in low humidity: The large leaves lose moisture rapidly in dry air. Maintain humidity above 55% with a humidifier or pebble tray, particularly in centrally heated rooms in winter if the plant has not yet gone dormant.

What skinners achimenes's hardiness rating actually means

Skinners Achimenes 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 — 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). Skinners Achimenes has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

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

Skinners Achimenes hardiness — frequently asked questions

Is skinners achimenes cold hardy?

Skinners Achimenes 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. Skinners Achimenes can only live outside year-round in genuinely frost-free climates (roughly USDA 10–12); everywhere else it is a houseplant that summers out at most.

What is the minimum temperature skinners achimenes can survive?

What hardiness zone is skinners achimenes?

Skinners Achimenes is rated USDA 10–12 and RHS H1b — Sub-tropical — a normal warm home is fine, but it cannot go outside in a cool season.

Can skinners achimenes 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 skinners achimenes 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.