Pansy seeds are some of the easiest seeds to collect. If you have a lovely variety you'd like to harvest and resow for next spring but don't know how, I've got you covered. Everywhere you see a spent flower there will be a little seed pod in its place. All you have to do is gently pick it off and inside will be full of tiny seeds. You don't want to pick them too soon because sometimes when I've done that the seeds aren't quite formed. I try to pick mine before they pop open on their own which for me is 2 to 3 days after the flower has fallen off. I've never daily watched to see just how long it takes before it pops open on its own, so if you have the time to do that then by all means. I just go out every other day or so and see what's there and just keep adding to my seed envelope.