U.S. Customs finds opium pods headed for Dover at Port of Wilmington U.S. Customs finds opium pods headed for Dover at Port of Wilmington Rain is coming so its time to harvest the ripe poppy seeds. Once the poppy pods have dried and the interior seeds matured to a rich brown or black, I clip the tops from the pods and pour out the Development of a Method to Extract Opium Poppy (Papaver somniferum L.) DNA from Heroin Scientific Reports