Cold hardiness & minimum temperature

Is Indian Shot (Canna indica)cold hardy? Hardiness zone & min temp

Also called Indian Shot, Canna Lily, Arrowroot Canna, Queensland Arrowroot.

More about indian shot

About Indian Shot

Canna indica · also called Indian Shot, Canna Lily · tropical

Canna indica is a vigorous tropical perennial native to the Americas, grown for its bold paddle-shaped foliage and bright orange-red flowers. Rhizomes store starch and are edible in some cultures. The ASPCA lists Canna species as non-toxic to dogs and cats, making it a pet-friendly tropical.

Cold limit: USDA 7-12 (rhizomes may need lifting in zones 7-8) · RHS H3 (15-35°C)

Watch for — Rhizome rot in winter: In cool climates, rhizomes left in wet soil over winter often rot. Lift, dry, and store in dry compost in a frost-free location.

What indian shot's hardiness rating actually means

Indian Shot 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 7-12 (rhizomes may need lifting in zones 7-8) — 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. Indian Shot shrugs off cold nights but a real, sustained freeze will kill it.

Concretely, for indian shot 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 indian shot go outside or overwinter — and where?

It can live outside year-round only in the mildest, most sheltered part of USDA 7-12 (rhizomes may need lifting in zones 7-8) 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 indian shot 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 indian shot

Indian Shot 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.

Indian Shot hardiness — frequently asked questions

Is indian shot cold hardy?

Indian Shot 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 7-12 (rhizomes may need lifting in zones 7-8) (and sheltered UK gardens) indian shot can stay out; in colder areas it must be lifted, brought in, or treated as a frost-tender plant.

What is the minimum temperature indian shot can survive?

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

What hardiness zone is indian shot?

Indian Shot is rated USDA 7-12 (rhizomes may need lifting in zones 7-8) and RHS H3 — Half-hardy — comes through mild UK winters outside but is killed by a hard freeze.

Can indian shot survive winter outside?

It can live outside year-round only in the mildest, most sheltered part of USDA 7-12 (rhizomes may need lifting in zones 7-8) 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 indian shot 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.