Iris seed germination

Hello,
How can I germinate Dutch Iris seeds. Can I sow them directly into the 
ground outdoors? I live in zone 7.

Also, I have some Neomarica gracilis, (Walking Iris) seeds. Do you know 
how I can germinate them. Here is some info I found on the plant.
Neomarica gracilis, (Walking Iris). Old fashioned walking iris, with 
intricately designed white flowers accented by purple and brown streaks 
and spots. Glossy green, arching leaves, like an iris. Height less than 2 
feet. For partial to full shade. Southern Mexico to Brazil. Give winter 
protection. Zones 8b-11

Thanks,
Suzanne
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