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The earliest cultivators had long collected seed from both annual and perennial plants; however, they found the annuals to be better adapted to the soil disturbance and annual sowing they had adopted in order to maintain a convenient and steady supply of grains harvested from the annual plants.Although some of the wild annuals first to be domesticated, such as wheat and barley, were favored because they had large seeds, others had seeds comparable in size to those of their wild perennial counterparts.

Annual crops do, however, have some advantages over perennial crops in terms of management flexibility.With each year’s sowing of the annuals, desirable traits were selected for and carried on to the next generation.Thus, selection pressure was applied, albeit unintentionally, to annual plants but not to perennials.And because of factors including climate change, rising energy costs, and land degradation, the number of “urgently hungry” people, now estimated at roughly 1 billion, is at its highest level ever.More troubling, agriculture-related problems will probably worsen as the human population expands—that is, unless we reshape agriculture.

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