According to Wikipedia: “Pineberries were nearly extinct until 2003, when Dutch farmers saved the plant. The farmers found the plant in France and decided to grow it commercially. As a result of many selections over time, the plants they found yielded only one or two berries per plant. The farmers took cuttings and grew hundreds of plants and selected the healthy ones. This was repeated for six years until they had healthy plants.”
Source: Wikipedia:

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