Cold hardiness & minimum temperature

Is Curry plant (Helichrysum italicum)cold hardy? Hardiness zone & min temp

Also called Curry plant, Immortelle, Italian everlasting.

More about curry plant

About Curry plant

Helichrysum italicum · also called Curry plant, Immortelle · herb

Curry plant is an aromatic Mediterranean sub-shrub with silver-grey, needle-like foliage that releases a strong curry-like fragrance when brushed. It thrives in full sun with lean, alkaline, very well-drained soil and is moderately drought-tolerant once established. Small, bright yellow button flowers appear in summer and attract pollinators.

Cold limit: USDA 8-11 · RHS H4 (5–30°C)

Watch for — Root rot from winter wet: The leading cause of loss in temperate climates. Improve soil drainage with grit, raise planting level slightly, and protect from prolonged winter rainfall with a cloche or placing in a pot under cover.

What curry plant's hardiness rating actually means

Yes — curry plant is genuinely cold hardy. Rated RHS H4 and USDA 8-11, it lives outdoors all year and needs winter cold rather than protection from it. Its RHS rating of H4 means: Hardy in an average winter across much of the temperate world. On the US scale that maps to USDA 8-11 — 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 −10 to −5 °C. Curry plant is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for curry plant as it gets too cold:

It tolerates winter lows to about −10 to −5 °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 curry plant go outside or overwinter — and where?

Plant it out within USDA 8-11 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 curry plant can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H4 figure above.

Curry plant hardiness — frequently asked questions

Is curry plant cold hardy?

Yes — curry plant is genuinely cold hardy. Rated RHS H4 and USDA 8-11, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Curry plant is hardy across USDA 8-11; 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 curry plant can survive?

Minimum survivable temperature is roughly about −10 to −5 °C. Curry plant is built for winter — once established it takes hard frost and snow in its stride.

What hardiness zone is curry plant?

Curry plant is rated USDA 8-11 and RHS H4 — Hardy in an average winter across much of the temperate world.

Can curry plant survive winter outside?

Plant it out within USDA 8-11 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 curry plant below its minimum temperature?

It tolerates winter lows to about −10 to −5 °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.