Cold hardiness & minimum temperature

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

Also called All Gold Lemon Balm, Golden Lemon Balm.

More about all gold lemon balm

About All Gold Lemon Balm

Melissa officinalis 'All Gold' · also called All Gold Lemon Balm, Golden Lemon Balm · herb

A striking herbaceous perennial with bright golden-yellow, lemon-scented foliage that softens to lime-green through summer. Hardy in USDA zones 4–9. Best colour develops in partial shade — full sun scorches the leaves. Clump-forming with square stems. Cut back after flowering to stimulate a fresh flush of vibrant new growth.

Cold limit: USDA 4-9 · RHS H5 (-15–30°C)

What all gold lemon balm's hardiness rating actually means

Yes — all gold lemon balm is genuinely cold hardy. Rated RHS H5 and USDA 4-9, 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 4-9 — 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. All Gold Lemon Balm is built for winter — once established it takes hard frost and snow in its stride.

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

Plant it out within USDA 4-9 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 all gold lemon balm can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H5 figure above.

All Gold Lemon Balm hardiness — frequently asked questions

Is all gold lemon balm cold hardy?

Yes — all gold lemon balm is genuinely cold hardy. Rated RHS H5 and USDA 4-9, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. All Gold Lemon Balm is hardy across USDA 4-9; 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 all gold lemon balm can survive?

Minimum survivable temperature is roughly about −15 to −10 °C. All Gold Lemon Balm is built for winter — once established it takes hard frost and snow in its stride.

What hardiness zone is all gold lemon balm?

All Gold Lemon Balm is rated USDA 4-9 and RHS H5 — Hardy in most of the UK and in cold winters.

Can all gold lemon balm survive winter outside?

Plant it out within USDA 4-9 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 all gold lemon balm 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.