Ever-grow an open-pollinated or heirloom variety from seed, only to have it not look or taste like the photo on the packet—or even like the “same” variety when you grew it before? Maybe not your fault. Seeds aren’t like widgets; someone has to take care of the living genetics to make sure subsequent generations remain true to type, and even continue to evolve. But who’s doing that critical, demanding work? I interviewed geneticist and longtime plant breeder Dr. John Navazio—former senior scientist with the Organic Seed Alliance and now manager of plant breeding at Johnny’s Selected Seeds—to answer those seedy questions and more. 
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Every time over the years that I’ve spoken to today’s guest, one word comes up: oak. If entomologist and University of Delaware Professor Doug...