In the United States an estimated 90 percent of our historic fruit and vegetable varieties have vanished.

在美国，估计史上有的果蔬品种90%已经绝迹。

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Rich in mountains while lacking rivers, Shanxi is scarce in its vegetable varieties.

山西是多山少川的内陆地区，蔬菜品种少。

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Broccoli, cabbage and other vegetable varieties grown in accordance with procedures for export production, risk-free.

西兰花，白菜等蔬菜品种按照出口生产程序种植，无风险。

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In the United States more than 90 percent of fruit tree and vegetable varieties found in farmers' fields at the beginning of the twentieth century are no longer there.

CNN: Feeding the future: Saving agricultural biodiversity

Whether it's unusual heirloom tomatoes, such as Aunt Ruby's German Green or Yellow Pear, or purple-leaved Black Pearl peppers, which were introduced by the U.S. National Arboretum in 2006, interesting-looking vegetable varieties are more widely available.

WSJ: Who Put Lettuce in My Daffodils?

Biotecture have successfully trialled a wall which grew 45 varieties of vegetable.

CNN: Green walls create new urban jungles