My only worry about leaving the fluff on, when wanting to make sure that the seeds stay put, is that they are naturally meant to fly. I will plant them with the fluff if I can't learn of a super easy way to remove it, but I think these need light to germinate, so I think the fluff needs to be removed, or at least covered, in order for the seeds to stay where you want them. I really don't know what I'm doing though, and may be way off on that! Possibly once the fluff gets wet, it won't matter. I now have 12 1/2 acres of land to work with, but I don't want 12 1/2 acres of milkweed! Right now, I only have one very small patch of the plant, and I'd love to get a rather large patch growing in several areas.