Cold hardiness & minimum temperature

Is Field Sage (Salvia campestris)cold hardy? Hardiness zone & min temp

Also called Field Sage, Steppe Sage.

More about field sage

About Field Sage

Salvia campestris · also called Field Sage, Steppe Sage · flowering

Salvia campestris is a hardy herbaceous perennial native to the open steppes, dry meadows, and rocky hillsides of Turkey, the Caucasus, and the eastern Balkans. It produces whorled spikes of violet-blue to purple flowers from late spring through summer above a basal rosette of grey-green, textured leaves. As a steppe species it is strongly drought-tolerant and thrives in poor, sharply-drained soils where richer-soil plants struggle. The ASPCA considers the Salvia (sage) genus non-toxic to dogs and cats.

Cold limit: USDA 6-9 · RHS H5 (-15 to 35°C)

Watch for — Crown and root rot: The most common cause of failure; occurs when the plant sits in wet or poorly-drained soil, especially over winter — sharp drainage and raising the crown slightly when planting prevents this.

What field sage's hardiness rating actually means

Yes — field sage is genuinely cold hardy. Rated RHS H5 and USDA 6-9, it lives outdoors all year and needs winter cold rather than protection from it. Its RHS rating of H5 means: Hardy in most of the UK and in cold winters. On the US scale that maps to USDA 6-9 — 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 −15 to −10 °C. Field Sage is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for field sage as it gets too cold:

It tolerates winter lows to about −15 to −10 °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 field sage go outside or overwinter — and where?

Plant it out within USDA 6-9 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 field sage can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H5 figure above.

Field Sage hardiness — frequently asked questions

Is field sage cold hardy?

Yes — field sage is genuinely cold hardy. Rated RHS H5 and USDA 6-9, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Field Sage is hardy across USDA 6-9; 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 field sage can survive?

Minimum survivable temperature is roughly about −15 to −10 °C. Field Sage is built for winter — once established it takes hard frost and snow in its stride.

What hardiness zone is field sage?

Field Sage is rated USDA 6-9 and RHS H5 — Hardy in most of the UK and in cold winters.

Can field sage survive winter outside?

Plant it out within USDA 6-9 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.

What happens to field sage below its minimum temperature?

It tolerates winter lows to about −15 to −10 °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.