Whole and sliced Blue Autumn Radishes on a white background.
Cut and whole Blue Autumn Radishes surrounded by slices on white background.
Whole and sliced Blue Autumn Radishes on a white background.
Cut and whole Blue Autumn Radishes surrounded by slices on white background.

Radish Seeds,
Blue Autumn

52 ReviewsSKU: #RD168Min. seed count: 200
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Description

(Raphanus sativus). A perplexing, purple-blue chunky tapered radish, with ivory-white flesh. These roots are not commonly found growing in the U.S. but are a popular hearty winter kitchen treat in Germany, where they are used in a multitude of dishes from savory hearty winter salads to robust warming soups like Rettich Kartoffel Suppe, prepared with potatoes and radish. The tender white flesh is mildly flavored with hints of pepper, and these roots remain crisp and juicy even at larger sizes. These radishes are best sown in mid-late summer for fall and winter harvesting and boast the brilliant ability to store for extended periods after harvest when kept in a root cellar, cool frost-free shed, or outbuilding.

Growing Tips: Blue Autumn radishes are cool-season crops that thrive in loose, well-draining soil rich in organic matter. Consistent moisture is key to developing crisp, mild roots. Thin seedlings promptly to prevent overcrowding, and mulch to retain soil moisture and suppress weeds.

Plant Details

Botanical Name
Raphanus sativus
Life Cycle
Annual
Sun Requirement
6–8 hr.
Days to Germinate
4–10
Days to Maturity
40–60
Planting Depth
½ in.
Plant Spacing
2–4 in.
Ideal Temperature
50°F to 70°F
Frost Hardy
Yes

When to Grow

Sow Blue Autumn radish seeds outdoors in late summer to early fall for a robust autumn harvest. In mild winter areas, a second sowing in late fall may overwinter. If you’re not sure how to find your first and last frost dates, consult our blog post 'Our Experts Answer Questions, Share Resources.'

How to Sow and Plant

Prepare soil by loosening to a depth of at least 8 inches. Sow seeds ½ inch deep and 2 to 4 inches apart, in rows 12 inches apart. Water gently after planting to settle soil and encourage fast germination.

How to Grow

Keep soil consistently moist but not soggy to promote steady root development. Avoid excessive nitrogen fertilization, which encourages leafy tops at the expense of root size. Harvest promptly to prevent roots from becoming woody or overly spicy.

How to Save Seeds

  • Radishes are insect-pollinated, so you'll need to isolate varieties by up to 1⁄2 mile or stagger plantings to avoid flowering at the same time.
  • Staggering can be easy because of the radish's quick maturity.
  • Allow some radish plants to bolt and flower.
  • Leave seed pods to dry on the plant.
  • Harvest when pods are brown and brittle.
  • Crush pods to release seeds and separate chaff.
  • Dry seeds fully before storing in a cool, dry place.

FAQ

How big do Blue Autumn radishes get?

Blue Autumn radishes typically grow roots about 2 to 4 inches in diameter, with leafy tops reaching about 8–12 inches tall, depending on spacing and growing conditions.

Can Blue Autumn radishes survive a frost?

Yes, Blue Autumn radishes are frost-hardy and often develop an even sweeter flavor after exposure to light frosts, making them ideal for late-season harvesting

How do I know when Blue Autumn radishes are ready to harvest?

Check for mature size about 40-60 days after planting. Gently brush back soil; if the shoulders of the radish are visible and about 2–4 inches across, they’re ready to pick.

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