How is it best to sow freesia seeds after they set seed?

Freesia is a bulbous flowering plant, generally propagated from its rhizomes. Usually, after it finishes flowering and its leaves and stems turn yellow and wither, you move the pot to a shady spot to let the bulbs go dormant for the summer, or you dig the bulbs out, let them dry slightly, and store them, then replant them after September in autumn. However,