I save seed from my many different annuals and biennial each year. I have many packets to offer other wildflower lovers. The mix includes Welsh poppy, lychnis coronaria, papaver somniferum, knautia macedonica. All hardy.
Make sure the sowing area is just moist and soil not compacted. Rake it over. Scatter over the surface. Most need light to germinate.
They may not germinate this summer but will appear in the autumn.