Cold hardiness & minimum temperature

Is China Girl dogwood (Cornus kousa 'China Girl')cold hardy? Hardiness zone & min temp

Also called China Girl dogwood, Kousa dogwood, Chinese dogwood.

More about china girl dogwood

About China Girl dogwood

Cornus kousa 'China Girl' · also called China Girl dogwood, Kousa dogwood · flowering

China Girl dogwood is a refined deciduous small tree bearing an exceptionally abundant display of large, four-bracted white flowers in June, weeks after North American dogwoods fade. Fleshy, raspberry-like fruits attract birds in autumn, while the foliage turns rich red-purple before falling. It resists dogwood anthracnose, making it more durable than native species.

Cold limit: USDA 5-8 · RHS H6 (-20 to 32°C)

Watch for — Scale insects on stems: Dogwood scale (Chionaspis corni) causes bark discoloration and dieback on crowded stems. Apply horticultural oil in late winter while dormant; remove heavily infested branches. Natural predators provide some control.

What china girl dogwood's hardiness rating actually means

Yes — china girl 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. China Girl dogwood is built for winter — once established it takes hard frost and snow in its stride.

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

China Girl dogwood hardiness — frequently asked questions

Is china girl dogwood cold hardy?

Yes — china girl 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. China Girl 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 china girl dogwood can survive?

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

What hardiness zone is china girl dogwood?

China Girl dogwood is rated USDA 5-8 and RHS H6 — Hardy throughout the UK and northern Europe.

Can china girl 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 china girl 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.