Cold hardiness & minimum temperature

Is Bougainvillea 'Miss Alice' (Bougainvillea 'Miss Alice')cold hardy? Hardiness zone & min temp

Also called Miss Alice bougainvillea, white bougainvillea.

More about bougainvillea 'miss alice'

About Bougainvillea 'Miss Alice'

Bougainvillea 'Miss Alice' · also called Miss Alice bougainvillea, white bougainvillea · tropical

'Miss Alice' is a compact, free-flowering white bougainvillea whose papery pure-white bracts contrast with bright green leaves. More restrained and bushier than the species, it suits pots, hanging baskets and small trellises. It flowers hardest in full sun with restrained watering and needs frost-free protection. Thorns and irritant sap make it best kept away from pets.

Cold limit: USDA 9b-11 outdoors; grown as a container or conservatory plant in cooler zones · RHS H2 (needs frost-free protection; damaged below roughly 1-5°C) (10-30°C)

Watch for — Leaf drop after moving indoors: Triggered by the shift to lower light, cold draughts or temperature swings when brought under cover for winter.

What bougainvillea 'miss alice''s hardiness rating actually means

Bougainvillea 'Miss Alice' is half-hardy (RHS H2). 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 H2 means: Tender — survives a frost-free greenhouse or a very mild, sheltered spot. On the US scale that maps to USDA 9b-11 outdoors; grown as a container or conservatory plant in cooler zones — 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 1 to 5 °C — tolerates cold but no real frost. Bougainvillea 'Miss Alice' shrugs off cold nights but a real, sustained freeze will kill it.

Concretely, for bougainvillea 'miss alice' as it gets too cold:

Down to roughly about 1 to 5 °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 bougainvillea 'miss alice' go outside or overwinter — and where?

It can live outside year-round only in the mildest, most sheltered part of USDA 9b-11 outdoors; grown as a container or conservatory plant in cooler zones 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 bougainvillea 'miss alice' can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H2 figure above.

Frost protection for borderline bougainvillea 'miss alice'

Bougainvillea 'Miss Alice' 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.

Bougainvillea 'Miss Alice' hardiness — frequently asked questions

Is bougainvillea 'miss alice' cold hardy?

Bougainvillea 'Miss Alice' is half-hardy (RHS H2). 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 9b-11 outdoors; grown as a container or conservatory plant in cooler zones (and sheltered UK gardens) bougainvillea 'miss alice' can stay out; in colder areas it must be lifted, brought in, or treated as a frost-tender plant.

What is the minimum temperature bougainvillea 'miss alice' can survive?

Minimum survivable temperature is roughly about 1 to 5 °C — tolerates cold but no real frost. Bougainvillea 'Miss Alice' shrugs off cold nights but a real, sustained freeze will kill it.

What hardiness zone is bougainvillea 'miss alice'?

Bougainvillea 'Miss Alice' is rated USDA 9b-11 outdoors; grown as a container or conservatory plant in cooler zones and RHS H2 — Tender — survives a frost-free greenhouse or a very mild, sheltered spot.

Can bougainvillea 'miss alice' survive winter outside?

It can live outside year-round only in the mildest, most sheltered part of USDA 9b-11 outdoors; grown as a container or conservatory plant in cooler zones 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 bougainvillea 'miss alice' 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.