Make successive plantings of short rows 10 to 14 days. Spring radishes can also be planted in late winter in a protected cold frame, window box, or container in the house or on the patio. Winter radishes require a much longer time to mature than spring radishes and are planted at the same time as late turnips. Winter radishes must be thinned to 2 to 4 inches or even farther apart to allow for proper root development. Care Radishes grow well in almost any soil that is well prepared, fertilized before planting, and has adequate moisture.
Slow development makes radishes hot in taste and woody in texture.
Common Problems Root maggots may tunnel into radishes. Apply a suggested soil insecticide before the next planting. The radishes are too old. Pull them when they are younger and smaller. Sometimes my radishes have a hot, bitter flavor.