Iris from seed

This year (unusually) many of my bearded irises have large healthy looking seed pods. I'd like to try propagating from seed. Two questions: 1. How do I know the seed is ripe for sowing? Should I wait for the pods to dry out and/or burst open? 2. Should I refrigerate the seeds before sowing? If so, for how long?
Thank you
Cali, in Corfu, Greece.
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