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https://www.raiplay.it/programmi/report - By Bernardo Iovene from Report of 11/15/2021. In the Viterbo area between Nepi and Lake Vico, 90 percent of the tree population is made up of hazelnuts, it is the Italian reservoir of spreadable hazelnut producers; it is now a monoculture, to the detriment of biodiversity. Pistoia, on the other hand, is the largest nursery district in Europe. There are about 1,400 companies that export ornamental plants all over the world, but the nurseries require soil to the detriment of arable crops, which in the Pistoia area almost no longer exist.