Seed saving, revisited

Last year I grew zinnias from saved seeds, and the plants succumbed to powdery mildew. I didn't save seeds from those diseased plants. I was feeling pretty sad about my failed experiment.  But I found some old seeds and gave them a try. They're thriving! Below are seeds I'm saving, and below that is another photo of a flower on the same plant of the saved seeds. I'm excited to try again next spring to see if they grow true or if they cross-pollinated with the many zinnias I planted. A warmer climate (or a  greenhouse) would make this happen faster than waiting until next year. Can't you hear the mom voice saying, "Don't wish your life away"?