Cold hardiness & minimum temperature

Is Red-Topped Sage (Salvia viridis)cold hardy? Hardiness zone & min temp

Also called Red-Topped Sage, Annual Clary, Painted Sage, Annual Clary Sage.

More about red-topped sage

About Red-Topped Sage

Salvia viridis · also called Red-Topped Sage, Annual Clary · flowering

Salvia viridis is a fast-growing annual native to the Mediterranean region, grown primarily for its showy coloured bracts — white, pink, or purple with darker veins — rather than its small flowers. It performs best in full sun and free-draining soil, and the colourful bracts make it an outstanding cut and dried flower. The key care fact is that it is a true annual and must be sown fresh each year, but it self-seeds freely if a few flower heads are left to mature. Salvia is listed as non-toxic to cats and dogs by the ASPCA.

Cold limit: USDA 4–11 (grown as annual) · RHS H2 (15–25°C)

What red-topped sage's hardiness rating actually means

Red-Topped Sage 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 4–11 (grown as annual) — 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. Red-Topped Sage shrugs off cold nights but a real, sustained freeze will kill it.

Concretely, for red-topped sage 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 red-topped sage go outside or overwinter — and where?

It can live outside year-round only in the mildest, most sheltered part of USDA 4–11 (grown as annual) 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 red-topped sage 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 red-topped sage

Red-Topped 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.

Red-Topped Sage hardiness — frequently asked questions

Is red-topped sage cold hardy?

Red-Topped Sage 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 4–11 (grown as annual) (and sheltered UK gardens) red-topped 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 red-topped sage can survive?

Minimum survivable temperature is roughly about 1 to 5 °C — tolerates cold but no real frost. Red-Topped Sage shrugs off cold nights but a real, sustained freeze will kill it.

What hardiness zone is red-topped sage?

Red-Topped Sage is rated USDA 4–11 (grown as annual) and RHS H2 — Tender — survives a frost-free greenhouse or a very mild, sheltered spot.

Can red-topped sage survive winter outside?

It can live outside year-round only in the mildest, most sheltered part of USDA 4–11 (grown as annual) 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 red-topped 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.