Cold hardiness & minimum temperature

Is Korean Mulberry (Morus australis)cold hardy? Hardiness zone & min temp

Also called Korean Mulberry, Chinese Mulberry, Indian Mulberry (misapplied), Tatarica Mulberry.

More about korean mulberry

About Korean Mulberry

Morus australis · also called Korean Mulberry, Chinese Mulberry · edible

Korean Mulberry is a compact, fast-growing mulberry species native to East Asia, valued for its sweet-tart red to purple fruits and its use in silk production. More shrub-like than most mulberries, it is highly adaptable to poor soils and urban conditions. Fruits are smaller than Morus nigra but produced prolifically and enjoyed fresh or in preserves.

Cold limit: USDA 4-9 · RHS H6 (-25 to 38°C)

What korean mulberry's hardiness rating actually means

Yes — korean mulberry is genuinely cold hardy. Rated RHS H6 and USDA 4-9, 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 4-9 — 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 Mulberry is built for winter — once established it takes hard frost and snow in its stride.

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

Plant it out within USDA 4-9 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 mulberry can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H6 figure above.

Korean Mulberry hardiness — frequently asked questions

Is korean mulberry cold hardy?

Yes — korean mulberry is genuinely cold hardy. Rated RHS H6 and USDA 4-9, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Korean Mulberry is hardy across USDA 4-9; 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 mulberry can survive?

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

What hardiness zone is korean mulberry?

Korean Mulberry is rated USDA 4-9 and RHS H6 — Hardy throughout the UK and northern Europe.

Can korean mulberry survive winter outside?

Plant it out within USDA 4-9 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 mulberry 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.