Seeds are the hard tiny bits left in your hand after you have pulled a dry blossom off it's stem in the field, squeshed and rolled around on your palm, the chaft falling away like dust in the wind.
Store the seed in a paper envelope (handmade or purchased) with the name of the flower written on it. Leave to rest in a dry dark cool place ( abasement shelf or closet).
Assemble a variety of seeds to experiment with in your garden or prairie land. Grasses, flowers, trees, vegetables, and fruits. Whatever you find, grab for your future garden depends on it.