Carol
WS works best for iris. Fridge might not have enough temps changing to accomodate iris tough shell. It is a long process too so be preapred to wair.

Put in the fidge for three month in the baggie and that is all the stratification you will need. SI doen not need fluctuating temps to germinate.

One more opinion, I find iris germinates best with a warm moist before the chill. Siberian self sow in my garden, following that, I give them about a month in a tsp or so of sterile moist sand or vermiculite on my desk in a tiny ziplock, then chill (either outdoors, or in my refrigerator where the temperature is about equal to that of my outdoor Winter average)

Thanks all. I'll give it a try.