I'm fighting a losing battle with these plants (pictured). No idea what they are called, but I always just call them "stickers".
I tried pulling them with the sticker pods intact and disposing of them to prevent them from spreading as much as possible, but that hasn't been effective. I'm thinking about applying a herbicide whenever I see a patch of them, but I'm thinking that by the time they have the seed pods developed it might be too late to do any good because the next generation is on the way.
My question is this: Will spraying herbicides (such as RoundUp) "kill" the sticker seed pods and prevent them from germinating in addition to killing the plant they are attached to?