Planting spring radishes in the spring is a good idea, as long as there is no frost around and the soil is soft enough to be dug. Cool weather is fine for planting the seeds. The plants should grow well and produce radishes quickly. Some varieties of spring radishes grow especially well in early spring.
Winter radishes need to be planted in mid to late summer. They take longer to mature than the spring ones, and should be ready by fall.
Radishes are usually grown from seeds. The root can sometimes be coaxed to grow an entire plant. However, the process is said to be moderately difficult.