Leave seed pods on plants until the flower and the plant dry up. Birds will eat some seeds through the course of this drying period. To prevent birds from eating the seeds, the National Center for Home Food Preservation recommends wrapping "the flower with cheesecloth to prevent the birds from eating the seeds" or removing the seed pods to dry "in a dehydrator at 100 degrees Fahrenheit."
Wear thick gloves. Dried sunflower seed pods have sharp thorn-like points.
Hold your sunflower seed pod, with both hands, inside your bag or bucket.
Snap your seed pod into two or more pieces.
Scrape seeds off the seed pod pieces, into the bag, with your knife.
Remove any pod debris from the gathered seeds.