Black Spanish Round

Family: Brassicaceae Root Vegetable

Sink your senses into Black Spanish Round’s velvety, inky skin—nearly black with a subtle charcoal sheen—giving way to crisp, white flesh that’s clean, bright, and pleasantly piquant.

At maturity, roots are round and well-filled, with a firm, snappy texture that holds its character from garden to table. Grow this classic black radish for bold fresh slices and for robust flavor in winter-style preparations, where its peppery bite shines through.

Light: Full SunMaturity: 70 DaysHabit: Taproot

Botanical illustration of Black Spanish Round

Planting schedules and alerts are optimized for Columbus (Zone 6b).

Crop Dates

Milestone	Date
Start Indoors	Direct Sow
Last Frost	Apr 25th
Transplant / Sow Outdoors	Apr 25th
Harvest Begins	Jul 4th
Harvest Ends	Oct 16th

Crop Details

Trait	Value
Days to Maturity	70
Sun Requirements	Full Sun
Growth Habit	Taproot
Support Needed	None
Planting Depth	Normal
Germination Temp (°F)	55
Min Soil Temp (°F)	45
Min Night Temp (°F)	28
Harden Off (days)	Not Required

Culinary Notes

Chef's Note

Black Spanish Round brings a tougher, more assertive radish bite than the quick-pickling types—crisp raw, then smoother and more mellow when you cook it. Slice it thick so it stays snappy, or grate it and let vinegar temper the burn without losing that peppery snap.

Best Uses

raw rounds for a high-voltage snack with butter or salt
shredded radish in cold slaws to cut through fattiness
grated with vinegar for a quick, sharp condiment
braised/roasted slices for a milder, sweeter heat

Flavor Profile

peppery, spicy bite with a clean snap slightly bitter edge that sweetens when cooked velvety inky skin giving way to crisp white flesh charcoal-like sharpness that carries into reductions

Kitchen Pairings

butter goat cheese honey citrus (lemon or orange) garlic beef or roast pork

Frequently Asked Questions

Why are my Black Spanish Round plants developing powdery white patches on leaves, and what should I do?

Powdery mildew commonly appears as a white, flour-like coating on cucumber/melon-type leaves (or related vine crops) in warm, humid stretches. Remove the worst affected leaves, avoid wetting foliage, and increase airflow by spacing vines and pruning lightly. If it keeps spreading, treat early with a sulfur-based fungicide labeled for food gardens and follow the label’s timing before harvest (Black Spanish Round is typically ready around 70 days).

How often should I water Black Spanish Round during the main growing phase to keep fruit setting well?

During active growth and fruit fill, keep the soil consistently moist but never soggy—aim for about 1 inch (2.5 cm) of water per week, adjusting for heat and rainfall. Water deeply at the base of the plant 1–2 times per week rather than frequent light sprinkles, and stop short of letting the soil dry out completely. Mulch helps reduce swings, which helps prevent misshapen fruit and stress-related leaf problems.

How do I tell when Black Spanish Round is ready to harvest?

Harvest when fruits reach full color and size for the variety, typically around 70 days after planting, and the skin feels firm with a deep, uniform dark color. If you gently lift the fruit and it separates cleanly or the stem dulls slightly, it’s usually ready—don’t wait until it gets soft. For best flavor, harvest in the morning and avoid leaving fruit on vines through heavy heat spikes.