The seeds can survive but you'd probably lose a lot to chipmunks, mice, birds, squirrels, ect. I've had volunteer sunflowers come up from overwintering seeds in the garden but I'm not sure what the survival rate would be on a big scale. You'd have to put them in late enough that you'd be sure they wouldn't sprout. I think what Dutch is saying is that if the seeds sprout in the fall they won't grow back in the spring. Maybe.