I save the zinnia blooms from the biggest, the best, and my favorite colors. I let them dry in trays and then I pull the seeds in the spring before planting. I should do it in the winter doldrums, but I get lazy & do it when I need them. Generally, I’ll pick up a couple of packages (2-3) of the large cactus types to add in. So far, this has worked to provide me with seeds every year - this year, I had half a brown lunch sack of seeds. Most of them germinate, too. I do have a bit of a challenge with the birds picking out the seeds before I can get the blooms cut off - the finches seem to love the seeds & will leave nothing but an empty “head” if you’re not quick about it. Good luck with yours - they’re a fairly ‘easy’ way to get a great patch of color & plenty of butterfly, bee & bird visitors.
My all-time favorite is Will Rogers. The PERFECT red:
I used up old and new seed this season, so I'm excited to see what I end up with. I didn't tag anything. I love them all. :)