Cold hardiness & minimum temperature

Is Chilean Jasmine (Mandevilla laxa)cold hardy? Hardiness zone & min temp

Also called Chilean Jasmine.

More about chilean jasmine

About Chilean Jasmine

Mandevilla laxa · also called Chilean Jasmine · flowering

Chilean jasmine (Mandevilla laxa) is a vigorous twining vine prized for clusters of fragrant, white trumpet flowers from summer into autumn. The hardiest mandevilla, it tolerates light frost, climbs 4.5-6 m on a support, and rewards full sun with rich soil and steady summer watering. It dies back in cool winters and regrows from the root.

Cold limit: USDA 8-11 (root-hardy with mulch in zone 8; container or annual elsewhere) · RHS H3 (15-28°C)

Watch for — Winter dieback: Top growth collapses after frost; this is normal for M. laxa. Mulch the crown heavily and cut back dead stems in spring as new shoots emerge.

What chilean jasmine's hardiness rating actually means

Chilean Jasmine is half-hardy (RHS H3). It survives a mild winter outdoors in a sheltered spot, but a hard frost kills it — so in colder zones it is lifted, potted, or grown as a tender plant. Its RHS rating of H3 means: Half-hardy — comes through mild UK winters outside but is killed by a hard freeze. On the US scale that maps to USDA 8-11 (root-hardy with mulch in zone 8; container or 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 to 1 °C — a light, short frost only. Chilean Jasmine shrugs off cold nights but a real, sustained freeze will kill it.

Concretely, for chilean jasmine as it gets too cold:

Down to roughly about −5 to 1 °C it copes, especially if dry and sheltered.
A sustained hard frost collapses the top growth; whether it returns depends on whether the roots, crown or tubers froze.
Wet cold is far more lethal than dry cold for this plant — soggy, frozen soil is the usual killer.

Can chilean jasmine go outside or overwinter — and where?

It can live outside year-round only in the mildest, most sheltered part of USDA 8-11 (root-hardy with mulch in zone 8; container or annual elsewhere) or a frost-free UK microclimate.
In colder zones, grow it in a pot you can move under cover, or lift its tubers/roots and store them frost-free over winter.
A south-facing wall, free-draining soil and a dry winter position can push it a full zone hardier than the books suggest.

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 chilean jasmine can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H3 figure above.

Frost protection for borderline chilean jasmine

Chilean Jasmine is right on a hardiness edge in many gardens, so if you are pushing it, these measures buy it the margin it needs:

Mulch the crown or root zone deeply with bark, straw or leaf-mould before the first hard frost.
Move container plants against a warm wall or into an unheated but frost-free porch or greenhouse.
Fleece the top growth on the coldest nights, and keep it on the dry side — dry roots survive cold far better than wet ones.
Lift dahlia-type tubers or tender crowns after the first light frost blackens the foliage and store them somewhere cool but frost-free.

Chilean Jasmine hardiness — frequently asked questions

Is chilean jasmine cold hardy?

Chilean Jasmine is half-hardy (RHS H3). It survives a mild winter outdoors in a sheltered spot, but a hard frost kills it — so in colder zones it is lifted, potted, or grown as a tender plant. Borderline outdoors. In its mild end of USDA 8-11 (root-hardy with mulch in zone 8; container or annual elsewhere) (and sheltered UK gardens) chilean jasmine can stay out; in colder areas it must be lifted, brought in, or treated as a frost-tender plant.

What is the minimum temperature chilean jasmine can survive?

Minimum survivable temperature is roughly about −5 to 1 °C — a light, short frost only. Chilean Jasmine shrugs off cold nights but a real, sustained freeze will kill it.

What hardiness zone is chilean jasmine?

Chilean Jasmine is rated USDA 8-11 (root-hardy with mulch in zone 8; container or annual elsewhere) and RHS H3 — Half-hardy — comes through mild UK winters outside but is killed by a hard freeze.

Can chilean jasmine survive winter outside?

It can live outside year-round only in the mildest, most sheltered part of USDA 8-11 (root-hardy with mulch in zone 8; container or annual elsewhere) or a frost-free UK microclimate. In colder zones, grow it in a pot you can move under cover, or lift its tubers/roots and store them frost-free over winter. A south-facing wall, free-draining soil and a dry winter position can push it a full zone hardier than the books suggest.

How do I protect chilean jasmine from frost?

Mulch the crown or root zone deeply with bark, straw or leaf-mould before the first hard frost. Move container plants against a warm wall or into an unheated but frost-free porch or greenhouse. Fleece the top growth on the coldest nights, and keep it on the dry side — dry roots survive cold far better than wet ones. Lift dahlia-type tubers or tender crowns after the first light frost blackens the foliage and store them somewhere cool but frost-free.