Southern food once owed much of its variety and agricultural vigor to wild plants.
Back in the rural areas the people gather wild plants, a traditional meal in times of hardship.
Agricultural villages disappeared, to be replaced by the temporary camps of pastoralists, whose herds grazed on wild plants which required less rainfall than farmed crops.
As Mr Yan points out, farming Artemisia not only gives firms more control over their supply, but also helps reduce the loss of biodiversity that comes from picking wild plants.
Some of them suffer from February to June, sensitive not only to dust and mould but to most of Arizona's wild flowers and plants.
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Being with metal and machines required a great deal more sensitivity than being with wild animals or with plants and trees.
The plants grow wild along highways and in other spots in the U.S. They are also considered ornamental by some gardeners and are cultivated for medicinal castor oil and other products.
Such sterile fields will offer little or no food or shelter to wildlife, and there is already evidence that the genes for herbicide resistance can spread to wild relatives of crop plants, leaving us with weeds resistant to weedkiller.
Animals have also starved to death because villagers, for eight months, have eaten the plants in the wild after crops withered in the field.
"We just happen to have up to date information on magnolias, but it's symptomatic of what's happening to plants in the wild in general, " Oldfield said.
That crop plants do badly in competition with wild species is to be expected.
While popular ornamental species continue to bloom in gardens, the flowering plants face a more precarious future in the wild as their native forest habitats are increasingly threatened by human activities, the authors warn.
The scheme should encourage wildlife such as lapwings, stone curlews and plants such as Devil's Bit Scabious and wild thyme.
Scientists long ago discovered, for example, how to give crop plants new traits by forcibly mating them with unrelated wild species known to contain natural pesticides, carcinogens, and anti-nutrients.
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Not far from El Celler de Can Roca, La Calendula's menu is built entirely around the flowers and plants that are typical of Costa Brava and Catalonia, including wild carrots, sorrel, liquorice and marigolds.
"Wild Medicine" (it has a jawbreaker of a subtitie: "Healing Plants Around the World Featuring the Italian Renaissance Garden") traces the history of plants as palliatives and prescriptions while making abundantly clear that their use for what ails you is hardly a thing of the past.
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Since 1976, trade in rhinoceros horn has been regulated under the Convention on International Trade in Endangered Species of Wild Fauna and Flora, a treaty signed by more than 175 countries to protect fish, wildlife and plants that are or may become imperiled as a result of demand in international markets.
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