TUTORIAL: How to Grow Somniferum Poppies Part 5
Part 5 (of 5) When to Harvest Opium Poppy Pods. How to identify Mature Papaver somniferum Pods & Plants. Where to Plant: Pots or Rows? Buy Viable Unwashed Poppy Seeds Legally Poppies will begin to bloom 10 to 12 weeks from the time you plant them. Their pedals will drop after about 48 to 72 hours. Then the pods will continue to grow for the next couple weeks. During this period, it's very important not to water them unless absolutely necessary. Once pods turn brown and begin to rattle with seeds, they are ready for harvest.