Seeds and planting materials are central to the agricultural system that feeds us all. Yet there has been surprisingly little interest in seriously analyzing the legal and political processes through which intellectual property rights and policy are constructed for this all-important biological diversity. Concentrating on the American experience, Unnatural Selection offers a comprehensive history and insightful sociological analysis of the struggle to own, control, and benefit from agriculture's plant diversity.

Unnatural Selection elucidates the seldom-told story of how the United States acquired seeds of non-native crops from abroad in the 1800s and multiplied and distributed them to farmers to encourage experimentation and crop adaptation to local conditions, thus promoting the spread of agriculture on the continent. It was one of the largest and most consequential agricultural experiments in human history.

In the United States it also gave rise to the modern seed and nursery industry which began to push for legal mechanisms to protect and advance their interests in the marketplace. Cary Fowler provides the most complete history to date of the origins of the Plant Patent Act of 1930 and the Plant Variety Protection Act of 1970. He examines how Congress and the Courts expanded these intellectual property rights, and then how and with what effect these issues of control and ownership became international controversies in the 1980s-controversies that continue, largely unresolved, to this day.

Features a new preface by the author.