Cold hardiness & minimum temperature

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

Also called April Cross daikon, spring daikon.

More about daikon 'april cross'

About Daikon 'April Cross'

Raphanus sativus var. longipinnatus 'April Cross' · also called April Cross daikon, spring daikon · edible

'April Cross' is an F1 daikon bred for strong bolt resistance, making it one of the few daikons reliable for spring sowing. It produces smooth, white, mild roots up to 40 cm. Slow to run to seed even in lengthening days, it suits spring through autumn sowing in deep, loose, stone-free soil.

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

Watch for — Occasional bolting: Though bolt-resistant, severe cold snaps after sowing or extreme stress can still trigger flowering. Sow once soil has warmed and keep growth steady.

What daikon 'april cross''s hardiness rating actually means

Yes — daikon 'april cross' is genuinely cold hardy. Rated RHS H4 and USDA Annual; grown in zones 2-11, spring or autumn, 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, spring or autumn — 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 'April Cross' is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for daikon 'april cross' 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 'april cross' go outside or overwinter — and where?

Plant it out within USDA Annual; grown in zones 2-11, spring or autumn 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 'april cross' can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H4 figure above.

Daikon 'April Cross' hardiness — frequently asked questions

Is daikon 'april cross' cold hardy?

Yes — daikon 'april cross' is genuinely cold hardy. Rated RHS H4 and USDA Annual; grown in zones 2-11, spring or autumn, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Daikon 'April Cross' is hardy across USDA Annual; grown in zones 2-11, spring or autumn; 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 'april cross' can survive?

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

What hardiness zone is daikon 'april cross'?

Daikon 'April Cross' is rated USDA Annual; grown in zones 2-11, spring or autumn and RHS H4 — Hardy in an average winter across much of the temperate world.

Can daikon 'april cross' survive winter outside?

Plant it out within USDA Annual; grown in zones 2-11, spring or autumn 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 'april cross' 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.