Cold hardiness & minimum temperature

Is Korean Angelica (Angelica gigas)cold hardy? Hardiness zone & min temp

Also called Korean Angelica, Giant Purple Angelica, Korean Masterwort.

More about korean angelica

About Korean Angelica

Angelica gigas · also called Korean Angelica, Giant Purple Angelica · flowering

Korean Angelica is a dramatic biennial or short-lived perennial prized for its deep burgundy-purple umbel flowers and bold, architectural foliage. It thrives in moist, humus-rich soil with partial shade and cool conditions. Plants self-seed freely, making them naturalise well in woodland gardens and damp borders.

Cold limit: USDA 4-8 · RHS H6 (5-25°C)

What korean angelica's hardiness rating actually means

Yes — korean angelica is genuinely cold hardy. Rated RHS H6 and USDA 4-8, 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 4-8 — 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. Korean Angelica is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for korean angelica 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 korean angelica go outside or overwinter — and where?

Plant it out within USDA 4-8 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 korean angelica can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H6 figure above.

Korean Angelica hardiness — frequently asked questions

Is korean angelica cold hardy?

Yes — korean angelica is genuinely cold hardy. Rated RHS H6 and USDA 4-8, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Korean Angelica is hardy across USDA 4-8; 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 korean angelica can survive?

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

What hardiness zone is korean angelica?

Korean Angelica is rated USDA 4-8 and RHS H6 — Hardy throughout the UK and northern Europe.

Can korean angelica survive winter outside?

Plant it out within USDA 4-8 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 korean angelica 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.