Cold hardiness & minimum temperature

Is Mandevilla 'Sun Parasol Crimson' (Mandevilla 'Sun Parasol Crimson')cold hardy? Hardiness zone & min temp

Also called Sun Parasol Crimson mandevilla, crimson dipladenia.

More about mandevilla 'sun parasol crimson'

About Mandevilla 'Sun Parasol Crimson'

Mandevilla 'Sun Parasol Crimson' · also called Sun Parasol Crimson mandevilla, crimson dipladenia · tropical

'Sun Parasol Crimson' is a vigorous Mandevilla hybrid grown for masses of velvety, deep crimson-red trumpet flowers against glossy dark green leaves. A heat-loving tropical twining vine, it flowers all summer in sun and warmth, climbing a trellis or trailing from containers. Treat as a frost-tender patio or conservatory plant in cool climates.

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

Watch for — Frost damage: This tender tropical is killed by frost. Bring it indoors or under glass before temperatures drop below about 7-10°C and overwinter cool and frost-free.

What mandevilla 'sun parasol crimson''s hardiness rating actually means

Mandevilla 'Sun Parasol Crimson' 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 (outdoors); grown as a tender patio/container plant 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 'Sun Parasol Crimson' has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

Concretely, for mandevilla 'sun parasol crimson' 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 'sun parasol crimson' 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 'sun parasol crimson' can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H1c figure above.

Mandevilla 'Sun Parasol Crimson' hardiness — frequently asked questions

Is mandevilla 'sun parasol crimson' cold hardy?

Mandevilla 'Sun Parasol Crimson' 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 'Sun Parasol Crimson' can only live outside year-round in genuinely frost-free climates (roughly USDA 10-11 (outdoors); grown as a tender patio/container plant elsewhere); everywhere else it is a houseplant that summers out at most.

What is the minimum temperature mandevilla 'sun parasol crimson' can survive?

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

What hardiness zone is mandevilla 'sun parasol crimson'?

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

Can mandevilla 'sun parasol crimson' 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 'sun parasol crimson' 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.