Cold hardiness & minimum temperature

Is Partridgeberry (Mitchella repens)cold hardy? Hardiness zone & min temp

Also called Partridgeberry, Twinberry, Running Box.

More about partridgeberry

About Partridgeberry

Mitchella repens · also called Partridgeberry, Twinberry · flowering

A delicate, mat-forming evergreen groundcover native to eastern North American woodlands. Produces pairs of small white tubular flowers in early summer that fuse to form a single bright red berry persisting through winter. Ideal for shaded, acidic woodland gardens; excellent in terrariums. Low-growing at 2–5 cm tall, spreading to 40 cm wide.

Cold limit: USDA 3-8 · RHS H6 (-35 to 24°C)

Watch for — Scale insects: Armoured scale can colonise the stems in sheltered positions. Inspect stems during late winter and treat with a horticultural oil spray (when temperatures are above 5°C) to smother overwintering scales.

What partridgeberry's hardiness rating actually means

Yes — partridgeberry is genuinely cold hardy. Rated RHS H6 and USDA 3-8, 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 3-8 — 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. Partridgeberry is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for partridgeberry 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 partridgeberry go outside or overwinter — and where?

Plant it out within USDA 3-8 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 partridgeberry can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H6 figure above.

Partridgeberry hardiness — frequently asked questions

Is partridgeberry cold hardy?

Yes — partridgeberry is genuinely cold hardy. Rated RHS H6 and USDA 3-8, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Partridgeberry is hardy across USDA 3-8; 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 partridgeberry can survive?

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

What hardiness zone is partridgeberry?

Partridgeberry is rated USDA 3-8 and RHS H6 — Hardy throughout the UK and northern Europe.

Can partridgeberry survive winter outside?

Plant it out within USDA 3-8 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 partridgeberry 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.