A half dozen Round Black Spanish Radishes with Picasso Postcards on a white background.
Round Black Spanish Radish with old coins on a gray background.
Whole and cut Round Black Spanish Radishes on gray background with a black handled knife.
A half dozen Round Black Spanish Radishes with Picasso Postcards on a white background.
Round Black Spanish Radish with old coins on a gray background.
Whole and cut Round Black Spanish Radishes on gray background with a black handled knife.

Radish Seeds,
Round Black Spanish

3.810 Reviews#RD101 · 200 seeds
Price
Regular price $3.50
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Description

(Raphanus sativus). Noir Gros Rond d'Hiver. Large 5-inch winter type, probably grown since the 16th century or before. Deep, near-black skin and snowy-white flesh; will keep all winter in good conditions. Fine, fairly hot flavor; good raw or cooked.

Plant Details

Botanical Name
Raphanus sativus
Life Cycle
Annual
Sun Requirement
Full sun
Days to Germinate
3–6
Days to Maturity
55
Planting Depth
¼ in.
Plant Spacing
4 in.
Ideal Temperature
50–75°F
Frost Hardy
Yes

Growing Guide

When to Grow

Round Black Spanish radishes are best planted in late summer for harvest after the weather begins to cool. The best temperature for optimal growth is 50-75 F. Growing them in cool weather helps maintain their sharp flavor and crisp texture, making them a great addition to your garden's cool-weather crops. 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

To plant Round Black Spanish radishes, sow seeds about 1/4 inch deep and 4 inches apart in rows spaced 12 inches apart to give the roots enough room for growth. Succession plant for a continuous harvest.

How to Grow

Water regularly to keep the soil evenly moist, ensuring the roots develop properly. Avoid waterlogging, which can cause root rot. Keep the planting area free of weeds to reduce competition for nutrients. A light mulch can help retain soil moisture and regulate temperature, creating an optimal growing environment​. Generally, no additional fertilization is needed if the soil is rich in organic matter. However, incorporating compost before planting can improve soil fertility.

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 flower stalks to shoot up and seed pods to dry on the plant before picking pods and opening by hand to remove the seeds.
  • Seeds will remain viable for up to 5 years when stored in an airtight container.

FAQ

How long does it take for Round Black Spanish radishes to mature?

This variety typically matures in about 55 days, making it slower to develop compared to other radish varieties. The longer maturity time allows the roots to develop their characteristic size and flavor.

Can Round Black Spanish radishes be grown in containers?

Yes, they can. Use a container that is at least 12 inches deep to accommodate the large roots. Ensure the container has good drainage and is placed in a sunny location.

How should I store Round Black Spanish radishes after harvesting?

These radishes store well and can be kept in a cool, dark place for several weeks. Proper storage allows you to enjoy their flavor throughout the winter months. Remove the greens before storing to prolong their shelf life.

Browse our full range of radish seeds.

Customer reviews

3.8 / 5 10 Reviews

What gardeners are saying

  • Sharp, spicy bite: Hot, dense flesh with a lasting kick; peel the thick black skin.

  • Grows big: Tennis-ball size and larger when given time to mature.

  • Easy and carefree: Sprouts within a week and grows in clay or potting soil.

  • Heads up: Slow to size up; plan on 90 days or more, not 30.

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