Radishes will fail to bulb for several reasons. Probably, they are not properly thinned and are growing too close together. Thin plants to a spacing of 1 inch apart when plants first emerge. Radishes should be seeded two to three seeds per inch and thinned when they are about 1 to 2 inches tall to a spacing of 1 inch apart. Radishes will also not bulb properly when forced to mature during temperatures above 80 to 85 degrees F.
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