Register at www.bringingbackthenatives.net for the Sunday, May 4, Bringing Back the Natives Garden Tour, with more than 60 pesticide-free, predominantly native-plant gardens in Alameda and Contra Costa Counties . The event again includes a May 3 and 4 Native Plant Sale at various locations, and possibilities for private guided tours on other weekends, including a gourmet bicycle tour and a Berkeley walking tour.