I can't help you with germinating patterns, especially with
a 4 month growing season, there are some Canadians both
here and on the other list that hybridize and start iris from seed
that should be able to answer your questions.
What I think I know is:
I. Siberica, would be a Siberian and seeds are very easy
to sprout in a short period of time, I've just started them
outdoors in a pots.
I.Yellow Flag, should be an iris Pseudacorus, a species iris,
very hardy swamp or bog plant, never tried to germinate these
but should be fairly easy if keep moist.
I. Graminea, Graminea is a small beardless Spuria iris.
these shouldn't be very difficult either.
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