Cold hardiness & minimum temperature

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

Also called Creeping Oregon Grape, Creeping Mahonia.

More about mahonia repens

About Mahonia repens

Mahonia repens · also called Creeping Oregon Grape, Creeping Mahonia · flowering

Mahonia repens is a low, creeping evergreen native to western North America, spreading by underground stems to form weed-suppressing carpets. Its matte, holly-like blue-green leaflets turn purple-bronze in winter, fragrant yellow flowers appear in spring, and edible blue-black berries follow. Exceptionally tough and shade-tolerant, it is a first-rate woodland and dry-shade ground cover.

Cold limit: USDA 4-8 · RHS H6 (-30 to 25°C)

Watch for — Winter leaf bronzing: Often mistaken for damage, the purple-bronze winter colour is normal and reverts to green in spring; no action needed.

What mahonia repens's hardiness rating actually means

Yes — mahonia repens 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. Mahonia repens is built for winter — once established it takes hard frost and snow in its stride.

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

Mahonia repens hardiness — frequently asked questions

Is mahonia repens cold hardy?

Yes — mahonia repens 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. Mahonia repens 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 mahonia repens can survive?

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

What hardiness zone is mahonia repens?

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

Can mahonia repens 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 mahonia repens 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.