It’s the time of year when backyard gardeners are gathering the last few tomatoes and squash of the summer harvest. But there’s one thing most gardeners don’t harvest: seeds. Seed saving is a technique that has fallen by the wayside in modern agriculture. The idea is to develop plants that are suited for the Bay Area's microclimates and to preserve crop biodiversity. As Lauren Sommer reports, a handful of people are starting their own seed-saving efforts.