Cold hardiness & minimum temperature

Is Satomi Dogwood (Cornus kousa 'Satomi')cold hardy? Hardiness zone & min temp

Also called Satomi Dogwood, Satomi Japanese Dogwood, Pink Kousa Dogwood.

More about satomi dogwood

About Satomi Dogwood

Cornus kousa 'Satomi' · also called Satomi Dogwood, Satomi Japanese Dogwood · flowering

Satomi Dogwood is a celebrated Cornus kousa cultivar bearing deep rose-pink to crimson bracts in early summer — one of the most vivid pink-flowered dogwoods. Foliage turns red-purple in autumn alongside ornamental red fruits. Resistant to dogwood anthracnose, it suits woodland gardens and focal plantings in moist, acidic soil.

Cold limit: USDA 5-8 · RHS H6 (-23 to 35°C)

Watch for — Root rot in wet soils: Prolonged waterlogging causes Phytophthora root rot. Plant on a slight elevation or add grit to improve drainage. Choose a well-drained site; never plant in a frost pocket where water pools.

What satomi dogwood's hardiness rating actually means

Yes — satomi dogwood is genuinely cold hardy. Rated RHS H6 and USDA 5-8, 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 5-8 — 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. Satomi Dogwood is built for winter — once established it takes hard frost and snow in its stride.

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

Plant it out within USDA 5-8 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 satomi dogwood can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H6 figure above.

Satomi Dogwood hardiness — frequently asked questions

Is satomi dogwood cold hardy?

Yes — satomi dogwood is genuinely cold hardy. Rated RHS H6 and USDA 5-8, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Satomi Dogwood is hardy across USDA 5-8; 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 satomi dogwood can survive?

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

What hardiness zone is satomi dogwood?

Satomi Dogwood is rated USDA 5-8 and RHS H6 — Hardy throughout the UK and northern Europe.

Can satomi dogwood survive winter outside?

Plant it out within USDA 5-8 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 satomi dogwood 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.