SproutSmart
SproutSmart Intelligent Garden Sowing

Black Spanish Round

Radish

Planting Schedule

Add Black Spanish Round to your garden to build a schedule and get reminders.
Botanical illustration of Black Spanish Round
70d to harvest

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.

Crop Dates

Growing note: Zone 1a has only 30 frost-free days — shorter than this crop's 70-day maturity. Outdoor planting is not viable; use protected cultivation.
MilestoneDate
Last FrostJun 15th
Growing ApproachProtected Environment Only

Crop Details

TraitValue
Days to Maturity70
Sun RequirementsFull SunFull sun
Growth HabitTaproot
Support NeededNone
Planting DepthNormal
Germination Temp (°F)55
Min Soil Temp (°F)45
Min Night Temp (°F)28
Harden Off (days)Not Required

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 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.
Botanical illustration of Black Spanish Round

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.