Cold hardiness & minimum temperature

Is Daikon 'Minowase' (Raphanus sativus var. longipinnatus 'Minowase')cold hardy? Hardiness zone & min temp

Also called Minowase daikon, Japanese long radish.

More about daikon 'minowase'

About Daikon 'Minowase'

Raphanus sativus var. longipinnatus 'Minowase' · also called Minowase daikon, Japanese long radish · edible

'Minowase' is a classic Japanese daikon producing long, cylindrical white roots reaching 40-50 cm in deep, loose soil. Crisp, mild, and juicy, it's grown for autumn harvest, pickling, and grating. Best sown midsummer to early autumn for a cool finish, it needs deep, stone-free ground to develop straight, unforked roots.

Cold limit: USDA Annual; grown in zones 2-11, best as an autumn crop · RHS H4 (roots tolerate light frost; lift before hard freezes) (10-24°C)

What daikon 'minowase''s hardiness rating actually means

Yes — daikon 'minowase' is genuinely cold hardy. Rated RHS H4 and USDA Annual; grown in zones 2-11, best as an autumn crop, it lives outdoors all year and needs winter cold rather than protection from it. Its RHS rating of H4 means: Hardy in an average winter across much of the temperate world. On the US scale that maps to USDA Annual; grown in zones 2-11, best as an autumn crop — 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 −10 to −5 °C. Daikon 'Minowase' is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for daikon 'minowase' as it gets too cold:

It tolerates winter lows to about −10 to −5 °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 daikon 'minowase' go outside or overwinter — and where?

Plant it out within USDA Annual; grown in zones 2-11, best as an autumn crop 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 daikon 'minowase' can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H4 figure above.

Daikon 'Minowase' hardiness — frequently asked questions

Is daikon 'minowase' cold hardy?

Yes — daikon 'minowase' is genuinely cold hardy. Rated RHS H4 and USDA Annual; grown in zones 2-11, best as an autumn crop, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Daikon 'Minowase' is hardy across USDA Annual; grown in zones 2-11, best as an autumn crop; 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 daikon 'minowase' can survive?

Minimum survivable temperature is roughly about −10 to −5 °C. Daikon 'Minowase' is built for winter — once established it takes hard frost and snow in its stride.

What hardiness zone is daikon 'minowase'?

Daikon 'Minowase' is rated USDA Annual; grown in zones 2-11, best as an autumn crop and RHS H4 — Hardy in an average winter across much of the temperate world.

Can daikon 'minowase' survive winter outside?

Plant it out within USDA Annual; grown in zones 2-11, best as an autumn crop 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 daikon 'minowase' below its minimum temperature?

It tolerates winter lows to about −10 to −5 °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.