Why do my radishes fail to bulb?

Asked May 25, 2014, 7:01 PM EDT

When I grow radishes, they grow fine but do not bulb. Can you help me? Tim S

Ramsey County Minnesota

1 Response

Radishes fail to bulb for several reasons. They may be planted in too much shade. They may be planted to thickly and not thinned. Spring radishes should be seeded two to three seeds per inch and thinned to a spacing of ½ to 1 inch apart. Sow seed 1/4 to 1/2 inch deep. Winter radishes must be thinned to 2 to 4 inches apart. Radishes will also not bulb properly when forced to mature during temperatures above 80 degrees to 85 degrees F. Radishes like soils that are high in potassium. They will not bulb if there is excess nitrogen.