Cold hardiness & minimum temperature

Is Mediterranean Sage (Salvia aethiopis)cold hardy? Hardiness zone & min temp

Also called Mediterranean Sage, African Sage, Woolly Sage.

More about mediterranean sage

About Mediterranean Sage

Salvia aethiopis · also called Mediterranean Sage, African Sage · herb

Salvia aethiopis is a biennial or short-lived perennial herb native to Eurasia (Mediterranean Europe through Central Asia), forming a large, soft rosette of deeply woolly white-felted leaves in the first year before sending up branching, candelabra-like stems to 90 cm bearing clusters of small white flowers in the second year. It thrives in dry, well-drained soils in full sun and is extremely cold-hardy once established. Note that this species is classified as a noxious weed in several western US states (Arizona, California, Colorado, Nevada, Oregon, Washington) and should not be deliberately planted in those regions. ASPCA lists the Salvia genus as non-toxic to pets.

Cold limit: USDA 5-9 · RHS H6 (-20 to 30°C)

Watch for — Crown rot in wet winters: Despite cold hardiness, the woolly crown is vulnerable to fungal rot in persistently waterlogged soils; plant on a slope or in raised beds and avoid mulching over the crown.

What mediterranean sage's hardiness rating actually means

Yes — mediterranean sage is genuinely cold hardy. Rated RHS H6 and USDA 5-9, it lives outdoors all year and needs winter cold rather than protection from it. Its RHS rating of H6 means: Hardy throughout the UK and northern Europe. On the US scale that maps to USDA 5-9 — 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 −20 to −15 °C. Mediterranean Sage is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for mediterranean sage as it gets too cold:

It tolerates winter lows to about −20 to −15 °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 mediterranean sage go outside or overwinter — and where?

Plant it out within USDA 5-9 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 mediterranean sage can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H6 figure above.

Mediterranean Sage hardiness — frequently asked questions

Is mediterranean sage cold hardy?

Yes — mediterranean sage is genuinely cold hardy. Rated RHS H6 and USDA 5-9, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Mediterranean Sage is hardy across USDA 5-9; 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 mediterranean sage can survive?

Minimum survivable temperature is roughly about −20 to −15 °C. Mediterranean Sage is built for winter — once established it takes hard frost and snow in its stride.

What hardiness zone is mediterranean sage?

Mediterranean Sage is rated USDA 5-9 and RHS H6 — Hardy throughout the UK and northern Europe.

Can mediterranean sage survive winter outside?

Plant it out within USDA 5-9 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 mediterranean sage below its minimum temperature?

It tolerates winter lows to about −20 to −15 °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.