Radish plants produce flowers that become seed pods after fertilization. The pods can be harvested at the end of the growing season. They should be allowed to dry before being split open to remove the seeds. Radish seeds can be purchased in garden supply centers.
Radishes are fast-growing root crops that come in a wide variety of sizes and flavors. Some varieties can be harvested in as little as three weeks after germination. Their leaves, immature seed pods, seeds and sprouts are also edible. Radishes are frequently used in salads and are important in European and Asian cuisines. Radish seeds produce an oil that shows potential as a biofuel.