Cold hardiness & minimum temperature

Is Cedar Sage (Salvia roemeriana)cold hardy? Hardiness zone & min temp

Also called Cedar sage, dwarf crimson-flowered sage, Roemer's sage.

More about cedar sage

About Cedar Sage

Salvia roemeriana · also called Cedar sage, dwarf crimson-flowered sage · flowering

Salvia roemeriana is a shade-tolerant perennial native to the Edwards Plateau of central and west Texas and the adjacent Mexican states of Coahuila and Nuevo León, where it grows in dappled shade beneath Ashe juniper and live oak. It produces vivid scarlet, tubular flowers from early spring through summer, making it one of very few sages that genuinely performs in shade. The most important care fact is to avoid continuous full sun, which stresses and stunts this woodland species; morning sun with afternoon shade is ideal. The ASPCA lists sage (Salvia) as non-toxic to cats and dogs.

Cold limit: USDA 7-10 · RHS H4 (-12°C to 38°C)

What cedar sage's hardiness rating actually means

Yes — cedar sage is genuinely cold hardy. Rated RHS H4 and USDA 7-10, it lives outdoors all year and needs winter cold rather than protection from it. Its RHS rating of H4 means: Hardy in an average winter across much of the temperate world. On the US scale that maps to USDA 7-10 — 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 −10 to −5 °C. Cedar Sage is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for cedar sage as it gets too cold:

It tolerates winter lows to about −10 to −5 °C once established.
Below its rated zone, the visible damage is browned or blackened top growth and, in the worst case, a killed crown or root.
First-year, newly planted, or container-grown specimens are noticeably less hardy than established garden plants — the roots are exposed.

Can cedar sage go outside or overwinter — and where?

Plant it out within USDA 7-10 and it overwinters with little or no help.
It does not want to come indoors — a warm winter room actually weakens a hardy plant by denying it dormancy.
The real risks in its range are waterlogging, wind-rock on young plants, and a late hard frost on new growth — not ordinary winter cold.

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 cedar sage can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H4 figure above.

Frost protection for borderline cedar sage

Cedar Sage is right on a hardiness edge in many gardens, so if you are pushing it, these measures buy it the margin it needs:

At the cold edge of its range, mulch the root zone in late autumn to buffer the deepest freezes.
Protect container specimens — pots freeze through far faster than open ground, costing roughly a zone of hardiness.
Shelter new growth from late spring frosts with fleece if a hard night is forecast.

Cedar Sage hardiness — frequently asked questions

Is cedar sage cold hardy?

Yes — cedar sage is genuinely cold hardy. Rated RHS H4 and USDA 7-10, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Cedar Sage is hardy across USDA 7-10; it belongs in the ground or a frost-proof container, not on a windowsill, and many types actively need a cold winter to perform.

What is the minimum temperature cedar sage can survive?

Minimum survivable temperature is roughly about −10 to −5 °C. Cedar Sage is built for winter — once established it takes hard frost and snow in its stride.

What hardiness zone is cedar sage?

Cedar Sage is rated USDA 7-10 and RHS H4 — Hardy in an average winter across much of the temperate world.

Can cedar sage survive winter outside?

Plant it out within USDA 7-10 and it overwinters with little or no help. It does not want to come indoors — a warm winter room actually weakens a hardy plant by denying it dormancy. The real risks in its range are waterlogging, wind-rock on young plants, and a late hard frost on new growth — not ordinary winter cold.

How do I protect cedar sage from frost?

At the cold edge of its range, mulch the root zone in late autumn to buffer the deepest freezes. Protect container specimens — pots freeze through far faster than open ground, costing roughly a zone of hardiness. Shelter new growth from late spring frosts with fleece if a hard night is forecast.