Cold hardiness & minimum temperature

Is Mandevilla 'Alice du Pont' (Mandevilla x amabilis 'Alice du Pont')cold hardy? Hardiness zone & min temp

Also called Pink Mandevilla, Rocktrumpet.

More about mandevilla 'alice du pont'

About Mandevilla 'Alice du Pont'

Mandevilla x amabilis 'Alice du Pont' · also called Pink Mandevilla, Rocktrumpet · flowering

'Alice du Pont' is a vigorous tropical twining vine grown for its large, glossy leaves and trumpet-shaped rose-pink flowers borne all summer. A tender perennial in cool climates, it is treated as a patio container plant or annual and overwintered frost-free. It loves heat, sun and humidity, climbing 3-6 metres on a trellis in a single season.

Cold limit: USDA 10-11 (tender; grown as a container/annual elsewhere) · RHS H1c (18-29°C)

Watch for — Cold damage: Frost-tender; suffers below about 10°C and is killed by frost. Bring containers indoors before autumn cold and overwinter frost-free, cutting back hard if needed.

What mandevilla 'alice du pont''s hardiness rating actually means

Mandevilla 'Alice du Pont' 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 H1c means: Warm-temperate — can summer outdoors but must come in well before the first frost. On the US scale that maps to USDA 10-11 (tender; grown as a container/annual elsewhere) — 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 5 °C (and never frost). Mandevilla 'Alice du Pont' has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

Concretely, for mandevilla 'alice du pont' as it gets too cold:

Below about about 5 °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 mandevilla 'alice du pont' go outside or overwinter — and where?

It can holiday outdoors in summer once nights are reliably above 5 °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 mandevilla 'alice du pont' can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H1c figure above.

Mandevilla 'Alice du Pont' hardiness — frequently asked questions

Is mandevilla 'alice du pont' cold hardy?

Mandevilla 'Alice du Pont' 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. Mandevilla 'Alice du Pont' can only live outside year-round in genuinely frost-free climates (roughly USDA 10-11 (tender; grown as a container/annual elsewhere)); everywhere else it is a houseplant that summers out at most.

What is the minimum temperature mandevilla 'alice du pont' can survive?

Minimum survivable temperature is roughly about 5 °C (and never frost). Mandevilla 'Alice du Pont' has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

What hardiness zone is mandevilla 'alice du pont'?

Mandevilla 'Alice du Pont' is rated USDA 10-11 (tender; grown as a container/annual elsewhere) and RHS H1c — Warm-temperate — can summer outdoors but must come in well before the first frost.

Can mandevilla 'alice du pont' survive winter outside?

It can holiday outdoors in summer once nights are reliably above 5 °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 mandevilla 'alice du pont' below its minimum temperature?

Below about about 5 °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.