Opium Flowers in Blossom
Although the consumption of opium is strictly forbidden, there are plantations for medical use. Paradoxically there is no fence, no guardian, actually nothing around to protect the plants from being stolen. And it is not necessary. To harvest the opium, the immature poppy seed pod has to be scratched. Then it exudes a white liquid. The liquid dries, oxidises and turns into a brownish lump which can be harvestet the next day. All the guardians need to do, is to find out if there are scratched pods. In that case they simply have to wait for the harvester.
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