One time a friend who's a marvelous gardener was going to do a project at her kid's school on seeds. I said I'd bring my collection over. I had all sorts of seeds to show her that I'd collected. She was a bit dumbfounded...had never thought of starting her garden with her own seeds! She was a smarty, too...(and a gardener!)... which made me realize that if Karen didn't get it, then lots of people didn't get it!
Last spring, I did a seed project with Arthur. We went outside, in his backyard, his front yard and across the street, looking for seeds...we gathered them up and displayed them. He then planted them (which was probably with mixed results, seeing how many of our seeds were not really mature or ripe).
There are seeds all around us...in the refrigerator, at the grocery store, on the dog or our jackets, and at the park. Get some neighborhood kids together and go on a seed hunt. Plant them (the seeds!) in a dixie cup or jiffy pot with some seed starter soil mix, about as deep as they are large, and keep them watered until they germinate. Each seed has it's own germination time (yea Google! Search Shasta Daisy germination time and you'll see how long it will take for my babies to break ground and anything else you might want to know!). Baby them until they're established a bit, and then put them in the ground or a pot where you can watch them grow. They may go dormant over the winter, but next spring, with luck you'll see the rest of the magic!