Cold hardiness & minimum temperature

Is Canary Island Sage (Salvia canariensis)cold hardy? Hardiness zone & min temp

Also called Canary Island Sage, Canary Sage, Paper Sage.

More about canary island sage

About Canary Island Sage

Salvia canariensis · also called Canary Island Sage, Canary Sage · flowering

Salvia canariensis is a vigorous evergreen shrub endemic to the Canary Islands, where it grows on dry rocky hillsides and scrubland. It forms a large, architectural specimen with thick stems densely clothed in white-woolly hairs, broad arrow-shaped grey-green leaves, and spectacular foot-long panicles of violet flowers with conspicuous rose-purple calyces from spring through summer. It is drought-tolerant and fast-growing but frost-sensitive, requiring greenhouse or conservatory protection in most of the UK. The ASPCA considers the Salvia (sage) genus non-toxic to dogs and cats.

Cold limit: USDA 8-11 · RHS H3 (-3 to 38°C (brief frost tolerated; kills top growth below -5°C))

Watch for — Frost dieback: Temperatures below -3°C kill the stems to ground level; in USDA zones 8-9 the rootstock usually regenerates from the base in spring — in the UK, move containerised plants under frost-free glass by October.

What canary island sage's hardiness rating actually means

Canary Island Sage 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 — 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. Canary Island Sage shrugs off cold nights but a real, sustained freeze will kill it.

Concretely, for canary island sage 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 canary island sage go outside or overwinter — and where?

It can live outside year-round only in the mildest, most sheltered part of USDA 8-11 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 canary island sage 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 canary island sage

Canary Island Sage 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.

Canary Island Sage hardiness — frequently asked questions

Is canary island sage cold hardy?

Canary Island Sage 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 (and sheltered UK gardens) canary island sage can stay out; in colder areas it must be lifted, brought in, or treated as a frost-tender plant.

What is the minimum temperature canary island sage can survive?

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

What hardiness zone is canary island sage?

Canary Island Sage is rated USDA 8-11 and RHS H3 — Half-hardy — comes through mild UK winters outside but is killed by a hard freeze.

Can canary island sage survive winter outside?

It can live outside year-round only in the mildest, most sheltered part of USDA 8-11 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 canary island sage 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.