The greater Bay Area is surrounded by a lot of commercial farmland, whether it's vineyards in Napa or strawberries in Watsonville. But there are also a number of urban farms—plots of land, or even rooftop gardens, that lie within big cities. With land at a premium, how can these small growers afford to grow food in an urban environment? Reporter Dana Cronin visits a few to find out.  Additional Reading: Bay Area Land Is So Expensive. How Do Urban Farms Survive?  Read a transcript of this episode here Get tickets for the Bay Curious book launch! This episode was reported by Dana Cronin. Bay Curious is made by Olivia-Allen Price, Amanda Font, Christopher Beale, Katherine Monahan and Brendan Willard. Additional support from Paul Lancour, Cesar Saldaña, Jen Chien, Jasmine Garnett, Carly Severn, Jenny Pritchett and Holly Kernan.