Growing Radishes in Zone 10a

Your planting timeline

1. Direct sowonce soil warms, around January 30
2. Harvestabout 22–35 days from transplant

Best varieties for zone 10a

Sow only in the cool months (fall to early spring) and stick to the fastest round salad radishes, since summer heat triggers bolting and turns roots woody and fiery before they size up.

Growing notes

Even, consistent moisture is the single biggest factor in good radishes. Keep the soil steadily damp — never bone-dry, never waterlogged — so the roots swell quickly and stay mild and crisp. Irregular watering, especially a drought followed by a heavy soaking, causes the roots to split or turn pithy and unpleasantly hot. In dry spring weather that usually means a thorough watering every two to three days; in cool, damp conditions rainfall may be enough. Water at the base in the morning to keep foliage dry, and mulch lightly between rows to hold moisture and even out the soil temperature.