Once the plants were dead and dry, I cut off the seed heads and I moved them from the backyard where I grew them, and put them in the front yard where I keep the feeder. Birds never came for the seeds, but squirrels from all over the neighborhood came for them. Every day for a couple of weeks I'd see them running down the street carrying a sunflower head in their mouth. Probably took them to some other person's house. I can see them wondering where all the dead sunflower heads in their yard were coming from.