There is no despair in a seed. There's only life, waiting for the right conditions-sun and water, warmth and soil-to be set free. Everyday, millions upon millions of seeds lift their two green wings.

At no time in our history have Americans been more obsessed with food. Options- including those for local, sustainable, and organic food-seem limitless. And yet, our food supply is profoundly at risk. Farmers and gardeners a century ago had five times the possibilities of what to plant than farmers and gardeners do today; we are losing untold numbers of plant varieties to...