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How to grow winter radishes

Frost-hardy · Cabbage family

When to sow and plant

  • Sow outdoors 1 July – 31 August

Based on: average for Germany, last frost 19 April, safe from 6 May

Planting calendar for your area
Where the dates come from

The weeks come from our sources; the dates use the average frost in Germany. Enter a German postcode to get dates for your area.

  • Sow outdoors: July to August (fixed months from a German source, not tied to frost) (LWG Bayerische Gartenakademie: Gemüsearten zur Nachkultur (Infoschrift))

Good and bad neighbours

Gardeners’ lore, not proven · 1

  • Swiss chardLore: good· D

    Traditional advice, not tested.

    D: Tradition, named by at least two sources

    Swiss chard

Crop rotation

After the cabbage family, leave the bed free of it for at least 4 years (sources: 4–5 years).

  • The same species should go back to the same spot after a break of 3 years at the earliest.
  • Example: grown here in 2026, again from 2031.
  • If clubroot has appeared in the bed: no plants of the cabbage family for at least 7 years, not even mustard as green manure.

At a glance

Family
Cabbage family (Brassicaceae)
Frost
Hardy, tolerates frost
Spacing (row × plant)
15 × 18 cm (6 × 7 in)
Plants per m²
37
Harvest
After 30–60 days from sowing

Spacing according to RHS: How to grow radishes. Other sources: – × 13 cm (– × 5 in) (UMN Extension: Growing radishes).

Questions and answers

When can I sow winter radishes?

Sow outdoors, average for Germany: 1 July – 31 August. Enter a German postcode above for your area, or your own frost date in the planting calendar.

How far apart should I plant winter radishes?

15 × 18 cm (6 × 7 in) (row × plant), according to RHS: How to grow radishes.

What grows well next to winter radishes?

Swiss chard: Gardeners’ lore, not proven (D).

How long a break do winter radishes need in the same bed?

After the cabbage family, leave the bed free of it for at least 4 years (sources: 4–5 years). The same species should go back to the same spot after a break of 3 years at the earliest.

More from the cabbage family

Sources

Show 9 sources
  1. RHS: How to grow radishes
  2. UMN Extension: Growing radishes
  3. LWG Bayerische Gartenakademie: Gemüsearten zur Nachkultur (Infoschrift)
  4. Cornell Cooperative Extension Orange County: Beginning a Vegetable Garden
  5. Landwirtschaftskammer Schleswig-Holstein: Fruchtfolge im Garten (Gartenmerkblatt, 2020)
  6. Südtiroler Bauernbund: Merkblatt Fruchtfolgen im Gemüsebau (Oktober 2022)
  7. GBIF Backbone Taxonomy (über die GBIF-API, species/match)
  8. BUND: Mischkultur – Gute und schlechte Nachbarn (August 2026)
  9. Gartenakademie Rheinland-Pfalz (DLR): Übersicht – Kultur verschiedener Gemüsearten im Hausgarten (o. J.)

Retrieved on 23 October 2026. Facts in our own words, one source per value.