There are many different kind of radishes which can be planted. The easiest to grow radish is called Cherry Belle, they mature in just 22 days. Radishes should be planted to full sun or partial shade with well drained soil. Add compost to the soil to speed up the process. Sow the radish seeds 1/2 inch (125 mm) deep and 1 inch (250 mm) apart. As they germinate, thin the successful seedlings to about 2 inches (5 cm) apart, allowing more space for bigger varieties. Rows should be planted about 1 foot (30 cm) apart.