The radish is a vegetable in a hurry. The time from seed to finished vegetable is short, about 20 - 60 days depending on the variety. The great thing about this vegetable is that it grows best at 10 degrees. This means that the seeds can be planted in the soil relatively early in the spring or in late summer and autumn. Preferably use a rich soil that retains moisture well. Sow a few different varieties with varying harvest times so that you can harvest radishes over as long a period as possible.