Cold hardiness & minimum temperature

Is Canna 'Pacific Beauty' (Canna 'Pacific Beauty')cold hardy? Hardiness zone & min temp

Also called Pacific Beauty Canna Lily.

More about canna 'pacific beauty'

About Canna 'Pacific Beauty'

Canna 'Pacific Beauty' · also called Pacific Beauty Canna Lily · flowering

Canna 'Pacific Beauty' is a compact, free-flowering cultivar bearing soft yellow to cream blooms on upright stems with green foliage. Its restrained height makes it well suited to containers and smaller gardens where taller cannas would overwhelm. Like all cannas, it thrives in full sun and moist, fertile soil. Mildly toxic to pets.

Cold limit: USDA 8-11 (lift rhizomes in colder zones) · RHS H3 (15-30°C)

Watch for — Overwintering rot: Rhizomes rot if stored too wet. Allow to cure and dry after lifting before storing in barely damp peat or vermiculite.

What canna 'pacific beauty''s hardiness rating actually means

Canna 'Pacific Beauty' 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 (lift rhizomes in colder 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 −5 to 1 °C — a light, short frost only. Canna 'Pacific Beauty' shrugs off cold nights but a real, sustained freeze will kill it.

Concretely, for canna 'pacific beauty' 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 canna 'pacific beauty' go outside or overwinter — and where?

It can live outside year-round only in the mildest, most sheltered part of USDA 8-11 (lift rhizomes in colder 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 canna 'pacific beauty' 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 canna 'pacific beauty'

Canna 'Pacific Beauty' 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.

Canna 'Pacific Beauty' hardiness — frequently asked questions

Is canna 'pacific beauty' cold hardy?

Canna 'Pacific Beauty' 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 (lift rhizomes in colder zones) (and sheltered UK gardens) canna 'pacific beauty' can stay out; in colder areas it must be lifted, brought in, or treated as a frost-tender plant.

What is the minimum temperature canna 'pacific beauty' can survive?

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

What hardiness zone is canna 'pacific beauty'?

Canna 'Pacific Beauty' is rated USDA 8-11 (lift rhizomes in colder zones) and RHS H3 — Half-hardy — comes through mild UK winters outside but is killed by a hard freeze.

Can canna 'pacific beauty' survive winter outside?

It can live outside year-round only in the mildest, most sheltered part of USDA 8-11 (lift rhizomes in colder 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 canna 'pacific beauty' 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.