Cold hardiness & minimum temperature

Is Golden Lemon Balm (Melissa officinalis 'Aurea')cold hardy? Hardiness zone & min temp

Also called Golden Lemon Balm, Variegated Lemon Balm, Golden Balm.

More about golden lemon balm

About Golden Lemon Balm

Melissa officinalis 'Aurea' · also called Golden Lemon Balm, Variegated Lemon Balm · herb

Golden Lemon Balm is a striking variegated form of culinary lemon balm, with leaves splashed bright golden-yellow and green, strongly scented of lemon. Equally useful as an ornamental edging plant or a culinary and herbal tea herb. Easy to grow in most soils. Considered non-toxic to pets by the ASPCA.

Cold limit: USDA 3-7 · RHS H6 (5-25°C)

What golden lemon balm's hardiness rating actually means

Yes — golden lemon balm is genuinely cold hardy. Rated RHS H6 and USDA 3-7, 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 3-7 — 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. Golden Lemon Balm is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for golden lemon balm 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 golden lemon balm go outside or overwinter — and where?

Plant it out within USDA 3-7 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 golden lemon balm can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H6 figure above.

Golden Lemon Balm hardiness — frequently asked questions

Is golden lemon balm cold hardy?

Yes — golden lemon balm is genuinely cold hardy. Rated RHS H6 and USDA 3-7, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Golden Lemon Balm is hardy across USDA 3-7; 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 golden lemon balm can survive?

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

What hardiness zone is golden lemon balm?

Golden Lemon Balm is rated USDA 3-7 and RHS H6 — Hardy throughout the UK and northern Europe.

Can golden lemon balm survive winter outside?

Plant it out within USDA 3-7 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 golden lemon balm 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.