Cold hardiness & minimum temperature

Is Korean Radish 'Altari' (Raphanus sativus var. caudatus 'Altari')cold hardy? Hardiness zone & min temp

Also called Altari radish, Korean kkakdugi radish, baby Korean radish.

More about korean radish 'altari'

About Korean Radish 'Altari'

Raphanus sativus var. caudatus 'Altari' · also called Altari radish, Korean kkakdugi radish · edible

'Altari', the Korean ponytail or chonggak radish, produces small, plump white roots with a green-tinted shoulder and prized, edible leafy tops. Crisp and pungent, it's the classic radish for kkakdugi and chonggak kimchi. Quick-maturing in around 50 days, it suits spring and autumn sowing in loose, fertile, stone-free soil.

Cold limit: USDA Annual; grown in zones 2-11 as a cool-season crop · RHS H4 (tolerates light frost; lift before hard freezes) (10-24°C)

What korean radish 'altari''s hardiness rating actually means

Yes — korean radish 'altari' is genuinely cold hardy. Rated RHS H4 and USDA Annual; grown in zones 2-11 as a cool-season 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 as a cool-season 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. Korean Radish 'Altari' is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for korean radish 'altari' 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 korean radish 'altari' go outside or overwinter — and where?

Plant it out within USDA Annual; grown in zones 2-11 as a cool-season 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 korean radish 'altari' can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H4 figure above.

Korean Radish 'Altari' hardiness — frequently asked questions

Is korean radish 'altari' cold hardy?

Yes — korean radish 'altari' is genuinely cold hardy. Rated RHS H4 and USDA Annual; grown in zones 2-11 as a cool-season crop, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Korean Radish 'Altari' is hardy across USDA Annual; grown in zones 2-11 as a cool-season 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 korean radish 'altari' can survive?

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

What hardiness zone is korean radish 'altari'?

Korean Radish 'Altari' is rated USDA Annual; grown in zones 2-11 as a cool-season crop and RHS H4 — Hardy in an average winter across much of the temperate world.

Can korean radish 'altari' survive winter outside?

Plant it out within USDA Annual; grown in zones 2-11 as a cool-season 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 korean radish 'altari' 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.