Cold hardiness & minimum temperature

Is Eau de Cologne Mint (Mentha × piperita f. citrata)cold hardy? Hardiness zone & min temp

Also called Eau de Cologne Mint, Bergamot Mint, Orange Mint, Lemon Mint.

More about eau de cologne mint

About Eau de Cologne Mint

Mentha × piperita f. citrata · also called Eau de Cologne Mint, Bergamot Mint · herb

Eau de Cologne Mint is a peppermint form with broad, smooth, dark green to purple-tinged leaves and a complex floral-citrus fragrance reminiscent of bergamot and lavender. Used in potpourri, bath products, herbal teas, and fruit salads, it grows vigorously. Moderate hardiness; best contained in pots to prevent unwanted spreading.

Cold limit: USDA 5–9 · RHS H5 (5–28°C)

What eau de cologne mint's hardiness rating actually means

Yes — eau de cologne mint is genuinely cold hardy. Rated RHS H5 and USDA 5–9, 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 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 −15 to −10 °C. Eau de Cologne Mint is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for eau de cologne mint 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 eau de cologne mint 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 eau de cologne mint can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H5 figure above.

Eau de Cologne Mint hardiness — frequently asked questions

Is eau de cologne mint cold hardy?

Yes — eau de cologne mint is genuinely cold hardy. Rated RHS H5 and USDA 5–9, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Eau de Cologne Mint 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 eau de cologne mint can survive?

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

What hardiness zone is eau de cologne mint?

Eau de Cologne Mint is rated USDA 5–9 and RHS H5 — Hardy in most of the UK and in cold winters.

Can eau de cologne mint 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 eau de cologne mint 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.