You must separate seed from filaments, capsules, or pods. To detach fly-away filaments, place seed heads in a paper bag with a few pebbles. Shake the bag. Peel open the bag to let the filaments fly away, pick out the pebbles, and you’ll be left with the seeds. For capsules and pods, when dry, pinch, roll, or pry open to remove seeds, then screen to separate seeds from remnants of capsules. For pulp-encased seeds, allow fruits and vegetables to fully ripen on the plant. Research the best method for harvesting wet seeds from particular plants. Some (including tomatoes) should be fermented to remove germination-inhibiting substances or to control growth of diseases. Artificial fermentation mimics the natural process of fermentation that occurs when the fruit is eaten by an animal or rots on the ground.