Cold hardiness & minimum temperature

Is Common Wormwood (Artemisia absinthium)cold hardy? Hardiness zone & min temp

Also called Common wormwood, Absinthe wormwood, Grand wormwood, Absinthium.

More about common wormwood

About Common Wormwood

Artemisia absinthium · also called Common wormwood, Absinthe wormwood · herb

Artemisia absinthium is an aromatic, silver-leaved herbaceous perennial native to temperate regions of Europe, Asia, and North Africa, with a long history of use as a medicinal herb and the source of thujone used in absinthe production. It thrives in full sun with well-drained, relatively poor soil and is notably drought tolerant once established. The single most important care point is to avoid heavy, waterlogged soil, particularly in winter, which quickly causes crown rot. It contains thujone, a toxic compound harmful to cats and dogs if ingested in significant quantities.

Cold limit: USDA 4-9 · RHS H6 (-20°C to 35°C)

What common wormwood's hardiness rating actually means

Yes — common wormwood is genuinely cold hardy. Rated RHS H6 and USDA 4-9, 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 — 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. Common Wormwood is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for common wormwood 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 common wormwood 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 common wormwood can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H6 figure above.

Common Wormwood hardiness — frequently asked questions

Is common wormwood cold hardy?

Yes — common wormwood is genuinely cold hardy. Rated RHS H6 and USDA 4-9, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Common Wormwood 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 common wormwood can survive?

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

What hardiness zone is common wormwood?

Common Wormwood is rated USDA 4-9 and RHS H6 — Hardy throughout the UK and northern Europe.

Can common wormwood 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 common wormwood 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.