Cold hardiness & minimum temperature

Is Mottled Wild Ginger (Asarum shuttleworthii)cold hardy? Hardiness zone & min temp

Also called Mottled Wild Ginger, Shuttleworth's Wild Ginger, Mottled Asarum.

More about mottled wild ginger

About Mottled Wild Ginger

Asarum shuttleworthii · also called Mottled Wild Ginger, Shuttleworth's Wild Ginger · flowering

Mottled Wild Ginger is a prized evergreen groundcover native to the southern Appalachian Mountains, distinguished by beautiful silver-mottled, deep green, heart-shaped leaves. It grows slowly but forms dense, weed-smothering mats in shaded gardens. Hidden brownish-purple jug-shaped flowers appear near the soil surface in spring. More drought-tolerant than Pacific Northwest species.

Cold limit: USDA 5–9 · RHS H5 (-20 to 25°C)

Watch for — Deer browsing: Although generally considered deer-resistant due to the pungent rhizome scent, hungry deer may browse foliage in winter when other food is scarce. Protect young plantings with wire cloches if deer pressure is high.

What mottled wild ginger's hardiness rating actually means

Yes — mottled wild ginger is genuinely cold hardy. Rated RHS H5 and USDA 5–9, 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 5–9 — 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. Mottled Wild Ginger is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for mottled wild ginger 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 mottled wild ginger go outside or overwinter — and where?

Plant it out within USDA 5–9 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 mottled wild ginger can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H5 figure above.

Mottled Wild Ginger hardiness — frequently asked questions

Is mottled wild ginger cold hardy?

Yes — mottled wild ginger is genuinely cold hardy. Rated RHS H5 and USDA 5–9, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Mottled Wild Ginger is hardy across USDA 5–9; 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 mottled wild ginger can survive?

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

What hardiness zone is mottled wild ginger?

Mottled Wild Ginger is rated USDA 5–9 and RHS H5 — Hardy in most of the UK and in cold winters.

Can mottled wild ginger survive winter outside?

Plant it out within USDA 5–9 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 mottled wild ginger 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.