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Poppy seed pods will transform from a greenish-blue color to brown when they are mature enough to harvest. The pod will be open at the top.
Allow for a period of dry time before harvesting. I quit watering for a week before harvesting my poppy pods.
Cut the pod stem leaving a few inches of stem for easy handling. Carefully place the pods in a container and allow them to dry a few more days.
Once the seed pods are completely dry and you can hear the rattling of seeds you can begin collecting. Tip the pods over and allow the seeds to pour out.
I plan to save my seeds to plant next year so I placed them in a paper envelope labeled with their name.
If you plan on consuming the poppy seeds, you will need to sift the seeds through a fine-mesh sieve. This will remove any leftover debris.