Cold hardiness & minimum temperature

Is Eastern Skunk Cabbage (Symplocarpus foetidus)cold hardy? Hardiness zone & min temp

Also called Eastern Skunk Cabbage, Skunk Cabbage, Meadow Cabbage, Swamp Cabbage, Polecat Weed.

More about eastern skunk cabbage

About Eastern Skunk Cabbage

Symplocarpus foetidus · also called Eastern Skunk Cabbage, Skunk Cabbage · flowering

A remarkable cold-hardy North American wetland perennial that generates its own heat to melt through snow in late winter. The mottled purple-and-green hooded spathe appears before the large, tropical-looking leaves unfurl in spring. Requires permanently wet, shaded ground. Unsuitable for dry gardens; superb in woodland bog gardens.

Cold limit: USDA 3-7 · RHS H7 (-20–20°C)

What eastern skunk cabbage's hardiness rating actually means

Yes — eastern skunk cabbage is genuinely cold hardy. Rated RHS H7 and USDA 3-7, it lives outdoors all year and needs winter cold rather than protection from it. Its RHS rating of H7 means: Hardy in the severest European continental winters. 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 below about −20 °C. Eastern Skunk Cabbage is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for eastern skunk cabbage as it gets too cold:

It tolerates winter lows to about −20 °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 eastern skunk cabbage 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 eastern skunk cabbage can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H7 figure above.

Eastern Skunk Cabbage hardiness — frequently asked questions

Is eastern skunk cabbage cold hardy?

Yes — eastern skunk cabbage is genuinely cold hardy. Rated RHS H7 and USDA 3-7, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Eastern Skunk Cabbage 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 eastern skunk cabbage can survive?

Minimum survivable temperature is roughly below about −20 °C. Eastern Skunk Cabbage is built for winter — once established it takes hard frost and snow in its stride.

What hardiness zone is eastern skunk cabbage?

Eastern Skunk Cabbage is rated USDA 3-7 and RHS H7 — Hardy in the severest European continental winters.

Can eastern skunk cabbage 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 eastern skunk cabbage below its minimum temperature?

It tolerates winter lows to about −20 °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.