Cold hardiness & minimum temperature

Is Canna 'Bengal Tiger' (Canna 'Bengal Tiger')cold hardy? Hardiness zone & min temp

Also called Bengal Tiger Canna, Pretoria Canna.

More about canna 'bengal tiger'

About Canna 'Bengal Tiger'

Canna 'Bengal Tiger' · also called Bengal Tiger Canna, Pretoria Canna · flowering

Canna 'Bengal Tiger' (syn. 'Pretoria') is one of the most striking cannas, with broad, bold green leaves striped in bright yellow-gold along the veins, and vivid orange flowers. It is widely grown as a tropical-accent specimen in borders and large containers. Full sun and ample moisture bring out its best. Rhizomes must be overwintered indoors in frost-prone areas. Mildly toxic to pets.

Cold limit: USDA 7-11 (lift in zones 6 and colder; protect with heavy mulch in zone 7) · RHS H3 (18-32°C)

Watch for — Botrytis on stored rhizomes: Fuzzy grey mould develops on rhizomes stored in cold, damp conditions. Improve ventilation, reduce moisture, and treat affected areas with a fungicide dust.

What canna 'bengal tiger''s hardiness rating actually means

Canna 'Bengal Tiger' 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 7-11 (lift in zones 6 and colder; protect with heavy mulch in zone 7) — 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 'Bengal Tiger' shrugs off cold nights but a real, sustained freeze will kill it.

Concretely, for canna 'bengal tiger' 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 'bengal tiger' go outside or overwinter — and where?

It can live outside year-round only in the mildest, most sheltered part of USDA 7-11 (lift in zones 6 and colder; protect with heavy mulch in zone 7) 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 'bengal tiger' 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 'bengal tiger'

Canna 'Bengal Tiger' 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 'Bengal Tiger' hardiness — frequently asked questions

Is canna 'bengal tiger' cold hardy?

Canna 'Bengal Tiger' 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 7-11 (lift in zones 6 and colder; protect with heavy mulch in zone 7) (and sheltered UK gardens) canna 'bengal tiger' 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 'bengal tiger' can survive?

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

What hardiness zone is canna 'bengal tiger'?

Canna 'Bengal Tiger' is rated USDA 7-11 (lift in zones 6 and colder; protect with heavy mulch in zone 7) and RHS H3 — Half-hardy — comes through mild UK winters outside but is killed by a hard freeze.

Can canna 'bengal tiger' survive winter outside?

It can live outside year-round only in the mildest, most sheltered part of USDA 7-11 (lift in zones 6 and colder; protect with heavy mulch in zone 7) 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 'bengal tiger' 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.