The seeds should germinate if planted correctly, but they do need to be removed from the pod. They should be collected once the pods have dried, turned brown, and started to open up. The seeds inside should no longer be green. If they need to be stored before being planted, they can be kept in an envelope.
Most iris seeds need to be exposed to cold to germinate. They could be planted outdoors in the fall or early winter. If this is done, they should be placed about an inch apart and a half inch to three-quarters of an inch deep in the soil. The soil should be kept moist but not wet. The seeds could be planted in a pot that is left outside instead of in the ground.
Some people recommend soaking the seeds before planting them to get a higher germination rate. Soaking is done for forty-eight hours to two weeks. The water must be changed daily. A strainer is useful to prevent the loss of seeds when the water is changed.
Although the steps described above work in many areas, you should consult a garden center or expert iris growers in your part of the world before you plant the seeds. The local environmental conditions over winter might mean that the steps need to be modified, such as by exposing the seeds to a cold period in a refrigerator instead of outdoors.