Why Do I Always Run Out of Radishes? How to Sow for Continuous Harvest

The frustrating experience of having fifty radishes ready all at once, eating as many as possible in a week, and then having none for the next month is a direct consequence of sowing radish once in a batch rather than in small, regular successions. Because radish has such a short growing season — typically three to four weeks from sowing to harvest — a single sowing produces a single flush that is finished very quickly. The solution is simple: sow small amounts every ten to fourteen days.

The succession sowing principle

Rather than sowing a whole packet at once, divide your sowing into small batches. Sow one short row (30–50 cm) every ten to fourteen days. By the time you harvest the first row, the second is beginning to mature, the third is germinating and the fourth is being sown. This staggered approach provides a steady, manageable supply rather than a single overwhelming glut followed by nothing.

Seasonal sowing calendar

In temperate climates, succession sow from March through April in spring (before day length triggers bolting), then pause the summer sowings through May to July for most standard varieties (bolt risk is high), then resume from mid-July through September for the autumn harvest. The spring and autumn windows each provide six to ten weeks of successive sowings, giving you radishes from April through November with proper succession management.

Summer gap and alternatives

Standard round spring radish bolts quickly in the long days of June and July. For summer radishes, grow daikon (mooli) types which tolerate long days better, or French Breakfast types which are slightly more bolt-resistant. Check seed catalogues for "summer" or "bolt-resistant" varieties specifically for the June–July window.

How many seeds to sow each time

A short row of 30–50 cm sown at one centimetre intervals gives you twenty to thirty plants. After thinning to the correct spacing (3–5 cm), you get ten to fifteen radishes per row — roughly one to two weeks' supply for a family. Adjust the row length up or down based on your consumption rate.