Propagation of Siberian Iris

Greeting to all from sunny, but cool Wisconsin,
 
Any one had experience w/ collecting Siberian iris seed in spring, after seeds were exposed to Z4-5 winter temperatures? keeping them moist in paper toweling to check for germination rates for about l week and nothing happening yet. Excluding these circumstances, what is the normal seed germination time? Like their stately fashion. Though they don't bloom less in the shade, their form and substance make them a pleasant foil for hostas.            Thanks. Bernie T. in WI
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