Radishes have been cultivated for thousands of years, likely first in Asia before spreading through the Mediterranean, Europe, and beyond. Over time, growers developed small spring radishes, larger winter types, long daikons, leafy forms, and varieties grown for their edible seed pods.
Radishes are quick-growing, cool-season roots that fit easily into beds, containers, and spaces between slower crops. Direct sow into loose soil, thin promptly, and keep moisture steady. Spring radishes may be ready within a month, while larger winter and daikon types need more time and room.
Growing Guide
Timing
Sow spring radishes several weeks before the average last frost, once the soil can be worked. Seeds germinate readily in soil around 40°F and emerge faster as it warms.
Make small sowings every 1–2 weeks while weather remains cool. Pause when sustained heat arrives, then resume in late summer for a fall crop.
Winter radishes and most daikons need a longer season. Sow them early enough to mature during cool fall weather, using the variety’s days to maturity and your first expected frost as guides.
Sowing & Starting
Direct sow seeds ¼–½ inch deep. Space small spring radishes about 1–2 inches apart and larger winter or daikon types 4–6 inches apart, following the packet for unusually large varieties.
Radishes do not need to be started indoors. Their quick growth and developing taproots make direct sowing the better choice.
Keep the seedbed moist until seedlings emerge, usually within 3–10 days. Thin early because crowded plants often produce leafy tops and undersized roots.
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