Cold hardiness & minimum temperature

Is Siberian dogwood (Cornus alba 'Sibirica')cold hardy? Hardiness zone & min temp

Also called Siberian dogwood, Westonbirt dogwood, coral-bark dogwood.

More about siberian dogwood

About Siberian dogwood

Cornus alba 'Sibirica' · also called Siberian dogwood, Westonbirt dogwood · flowering

Siberian dogwood is the most vividly colored cultivar of Cornus alba, producing brilliant scarlet-crimson winter stems that are even more striking than the species. Flat-topped creamy flower clusters appear in late spring, white berries follow, and the foliage turns red in autumn. It is a top choice for winter gardens and waterside plantings in cold climates.

Cold limit: USDA 2-8 · RHS H7 (-40 to 30°C)

Watch for — Dull stem color without pruning: The luminous scarlet color is only present on first- and second-year growth. Without hard rejuvenation pruning every 2–3 years in late winter, the shrub becomes a mass of dull gray-brown old wood. Coppice to 5–10 cm from the base for the best color.

What siberian dogwood's hardiness rating actually means

Yes — siberian dogwood is genuinely cold hardy. Rated RHS H7 and USDA 2-8, 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 2-8 — 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 below about −20 °C. Siberian dogwood is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for siberian dogwood 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 siberian dogwood go outside or overwinter — and where?

Plant it out within USDA 2-8 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 siberian dogwood can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H7 figure above.

Siberian dogwood hardiness — frequently asked questions

Is siberian dogwood cold hardy?

Yes — siberian dogwood is genuinely cold hardy. Rated RHS H7 and USDA 2-8, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Siberian dogwood is hardy across USDA 2-8; 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 siberian dogwood can survive?

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

What hardiness zone is siberian dogwood?

Siberian dogwood is rated USDA 2-8 and RHS H7 — Hardy in the severest European continental winters.

Can siberian dogwood survive winter outside?

Plant it out within USDA 2-8 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 siberian dogwood 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.