Oh believe me, I know about the seeds. We call them beggar lice, some call them hitch hikers & others have other names for them. PITA is what they are!
We have plenty here too of the smaller version that i will never be able to defeat but that doesn't mean I have to let the big ones get started, so I will pull those suckers before they have a chance to take over the place. I also have plenty of spanish needle too & it's a losing battle to try & eliminate them.