Cold hardiness & minimum temperature

Is Wild Garlic Vine (Mansoa alliacea)cold hardy? Hardiness zone & min temp

Also called Wild Garlic Vine, Garlic Vine, Ajo Sacha, Ajos Sacha.

More about wild garlic vine

About Wild Garlic Vine

Mansoa alliacea · also called Wild Garlic Vine, Garlic Vine · tropical

A vigorous Amazonian evergreen vine in the Bignoniaceae family, notable for its strongly garlic-scented foliage and twice-yearly flushes of trumpet flowers that open deep purple-lavender and fade to white. Full sun maximises flowering. Hardy to light frosts; best in USDA zones 9–11. Widely grown ornamentally and used in Amazonian folk medicine.

Cold limit: USDA 9-11 · RHS H1c (18–35°C; minimum 1–2°C briefly for established plants)

Watch for — Cold dieback: Temperatures below 1°C cause tip dieback; hard frost kills stems to the ground. Established plants may regrow from roots. Protect with horticultural fleece in borderline zones or bring container specimens indoors.

What wild garlic vine's hardiness rating actually means

Wild Garlic Vine 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 9-11 — 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 5 °C (and never frost). Wild Garlic Vine has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

Concretely, for wild garlic vine 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 wild garlic vine 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 wild garlic vine can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H1c figure above.

Wild Garlic Vine hardiness — frequently asked questions

Is wild garlic vine cold hardy?

Wild Garlic Vine 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. Wild Garlic Vine can only live outside year-round in genuinely frost-free climates (roughly USDA 9-11); everywhere else it is a houseplant that summers out at most.

What is the minimum temperature wild garlic vine can survive?

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

What hardiness zone is wild garlic vine?

Wild Garlic Vine is rated USDA 9-11 and RHS H1c — Warm-temperate — can summer outdoors but must come in well before the first frost.

Can wild garlic vine 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 wild garlic vine 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.