Cold hardiness & minimum temperature

Is Korean Spice Viburnum (Viburnum carlesii)cold hardy? Hardiness zone & min temp

Also called Koreanspice Viburnum.

More about korean spice viburnum

About Korean Spice Viburnum

Viburnum carlesii · also called Koreanspice Viburnum · flowering

Korean Spice Viburnum is a rounded, slow-growing deciduous shrub famed for intensely clove-scented spring flowers that open from pink-red buds into domed white clusters. Its dull green, slightly fuzzy leaves often flush wine-red in autumn. Easy and adaptable, it suits full sun to part shade in any moist, well-drained, fertile soil, rewarding gardeners with one of the most fragrant blooms in spring.

Cold limit: USDA 4-7 · RHS H6 (-34 to 30°C)

What korean spice viburnum's hardiness rating actually means

Yes — korean spice viburnum is genuinely cold hardy. Rated RHS H6 and USDA 4-7, 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 4-7 — 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. Korean Spice Viburnum is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for korean spice viburnum 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 korean spice viburnum go outside or overwinter — and where?

Plant it out within USDA 4-7 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 korean spice viburnum can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H6 figure above.

Korean Spice Viburnum hardiness — frequently asked questions

Is korean spice viburnum cold hardy?

Yes — korean spice viburnum is genuinely cold hardy. Rated RHS H6 and USDA 4-7, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Korean Spice Viburnum is hardy across USDA 4-7; 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 korean spice viburnum can survive?

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

What hardiness zone is korean spice viburnum?

Korean Spice Viburnum is rated USDA 4-7 and RHS H6 — Hardy throughout the UK and northern Europe.

Can korean spice viburnum survive winter outside?

Plant it out within USDA 4-7 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 korean spice viburnum 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.