How to Grow Black Spanish Round Radish
Raphanus sativus 'Black Spanish Round'
Black Spanish Round Radish is a quick-growing root vegetable prized for its crisp texture and mild flavor. Gardeners favor this heirloom variety because it matures rapidly in cool weather, offering a fresh harvest before summer heat sets in.
📷 Wikipedia: RadishStarting Black Spanish Round Radish: indoors or direct sow?
🌾 Sow directly in the garden — Black Spanish Round Radish is not usually started indoors.
This radish variety is best grown by direct seeding outdoors rather than starting indoors as seedlings.
Soil, care & harvest
Prepare loose soil with a pH between 6.0 and 7.0 to encourage healthy root development. As a cool-season crop, sow seeds directly outdoors two to six weeks before your last spring frost date. Plant them about one-half inch deep; germination typically occurs within four to ten days once conditions are right.
Space plants four to six inches apart in rows twelve inches wide to prevent overcrowding. Keep the soil consistently moist, aiming for one inch of water per week, but avoid wetting the foliage to reduce disease risk. Apply a light mulch around the base to retain moisture and suppress weeds without suffocating emerging roots.
Watch for flea beetles, cabbage root maggots, and aphids; encourage beneficial insects or use row covers early in the season. Prevent clubroot and black rot by ensuring good drainage and rotating crops annually. Harvest the crisp roots fifty-five to sixty-five days after sowing when they reach a firm size.
When to Plant Black Spanish Round Radish
Planting windows vary by USDA hardiness zone. Look up yours by ZIP code.
| Zone | Start Indoors | Direct Sow | Harvest |
|---|---|---|---|
| Zone 1 | — | June – July | August – September |
| Zone 2 | — | May – July | July – September |
| Zone 3 | — | May – June | July – October |
| Zone 4 | — | April – June | June – October |
| Zone 5 | — | April – May | June – November |
| Zone 6 | — | April – May | June – November |
| Zone 7 | — | March – May | May – November |
| Zone 8 | — | March – April | May – December |
| Zone 9 | — | February – March | April – December |
| Zone 10 | — | January – March | March – December |
| Zone 11 | — | January – February | February – December |
| Zone 12 | — | January – February | February – December |
| Zone 13 | — | January – February | February – December |
Companion Plants for Black Spanish Round Radish
✓ Good companions
Radishes break up soil for carrots and mature quickly, allowing carrots more space
Repel flea beetles and aphids that commonly attack radishes
Radishes repel cucumber beetles while cucumbers provide shade for radishes
Radishes mature quickly and don't compete for space with slower-growing lettuce
Repel root maggots and other soil pests that damage radish roots
Act as trap crop for flea beetles and aphids, protecting radishes
Fix nitrogen in soil and don't compete with radishes for root space
Compatible growing requirements and radishes help loosen soil for spinach roots
✗ Keep away from
Same family plants attract similar pests like flea beetles and clubroot disease
Inhibits growth of radishes and other root vegetables through allelopathic compounds
Compete for same nutrients and space, both being root vegetables in brassica family
Nutrition Facts
Per 100g serving (USDA FoodData Central)
