Cold hardiness & minimum temperature

Is Common Sorrel (Rumex acetosa)cold hardy? Hardiness zone & min temp

Also called Garden Sorrel, Spinach Dock.

More about common sorrel

About Common Sorrel

Rumex acetosa · also called Garden Sorrel, Spinach Dock · herb

Common sorrel is a hardy leafy perennial grown for its bright, lemon-sour arrow-shaped leaves that lift soups, sauces, and salads. One of the earliest greens of spring, it crops for years from a single clump. It thrives in cool, moist, fertile soil and tolerates partial shade, but its tang comes from oxalic acid.

Cold limit: USDA 4-8 · RHS H7 (5-24°C)

What common sorrel's hardiness rating actually means

Yes — common sorrel is genuinely cold hardy. Rated RHS H7 and USDA 4-8, it lives outdoors all year and needs winter cold rather than protection from it. Its RHS rating of H7 means: Hardy in the severest European continental winters. On the US scale that maps to USDA 4-8 — 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 below about −20 °C. Common Sorrel is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for common sorrel as it gets too cold:

It tolerates winter lows to about −20 °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 common sorrel go outside or overwinter — and where?

Plant it out within USDA 4-8 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 common sorrel can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H7 figure above.

Common Sorrel hardiness — frequently asked questions

Is common sorrel cold hardy?

Yes — common sorrel is genuinely cold hardy. Rated RHS H7 and USDA 4-8, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Common Sorrel is hardy across USDA 4-8; 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 common sorrel can survive?

Minimum survivable temperature is roughly below about −20 °C. Common Sorrel is built for winter — once established it takes hard frost and snow in its stride.

What hardiness zone is common sorrel?

Common Sorrel is rated USDA 4-8 and RHS H7 — Hardy in the severest European continental winters.

Can common sorrel survive winter outside?

Plant it out within USDA 4-8 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 common sorrel below its minimum temperature?

It tolerates winter lows to about −20 °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.