Cold hardiness & minimum temperature

Is Ginger Mint (Mentha × gracilis)cold hardy? Hardiness zone & min temp

Also called ginger mint, Scotch spearmint, red mint.

More about ginger mint

About Ginger Mint

Mentha × gracilis · also called ginger mint, Scotch spearmint · herb

Ginger mint is a hybrid of corn mint and spearmint, grown for its slim, gold-flecked pointed leaves, reddish stems, and warm, faintly spicy spearmint flavor. A hardy, fast-spreading perennial, it suits borders, containers, and culinary use. Give it moist, fertile soil in sun to part shade, and contain its runners as you would any mint to stop it overrunning neighbors.

Cold limit: USDA 4-9 (hardy perennial; dies back in winter, regrows from rhizomes) · RHS H6 (15-24°C)

What ginger mint's hardiness rating actually means

Yes — ginger mint is genuinely cold hardy. Rated RHS H6 and USDA 4-9 (hardy perennial; dies back in winter, regrows from rhizomes), 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 4-9 (hardy perennial; dies back in winter, regrows from rhizomes) — 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. Ginger Mint is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for ginger mint 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 ginger mint go outside or overwinter — and where?

Plant it out within USDA 4-9 (hardy perennial; dies back in winter, regrows from rhizomes) 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 ginger mint can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H6 figure above.

Ginger Mint hardiness — frequently asked questions

Is ginger mint cold hardy?

Yes — ginger mint is genuinely cold hardy. Rated RHS H6 and USDA 4-9 (hardy perennial; dies back in winter, regrows from rhizomes), it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Ginger Mint is hardy across USDA 4-9 (hardy perennial; dies back in winter, regrows from rhizomes); 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 ginger mint can survive?

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

What hardiness zone is ginger mint?

Ginger Mint is rated USDA 4-9 (hardy perennial; dies back in winter, regrows from rhizomes) and RHS H6 — Hardy throughout the UK and northern Europe.

Can ginger mint survive winter outside?

Plant it out within USDA 4-9 (hardy perennial; dies back in winter, regrows from rhizomes) 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 ginger mint 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.