Connecting islands in the sky to save an imperiled butterfly.
Barbara Kobayashi, Mike Belcher, Jeff Brown with Kids in Parks and Hoover Middle School students, Bob Hall, Ellen Papp, Joan and Jack Louie, Mike Ng and so many others care for 14+ butterfly habitat gardens in the Green Hairstreak Corridor. In addition to this, San Francisco State University students, supervised by Barbara Holzman, PhD, conduct research on the success of the Corridor.
In early spring, female Green Hairstreak butterflies (Callophrys viridis) mate and disperse looking for host plants to expand their population. This iridescent green nickel-sized butterfly can only fly a few hundred feet from her original habitat. In the Inner Sunset District of San Francisco, there are three distinct hilltop populations surrounded by neighborhoods. Because the populations are small and isolated, the butterflies would vanish without intervention.
In 2006, the Green Hairstreak Corridor was initiated by lepidopterist Liam O'Brien and continues to be managed by Nature in the City. The corridor connects these populations to each other with strategically placed Street Parks planted with the Hairstreak’s habitat, and cared for by neighborhood residents and schoolchildren. Every year, since inception, the population of butterflies and other associated insects and birds, has been increasing two-fold.
This brochure and self-guided tour celebrates the restored habitats in the Green Hairstreak Corridor. You can also click here for a browsable Google Map of the Corridor.
Included is our beneficial plant list for the project. Use this guide to create habitat in your yard or neighborhood garden, and help encourage these butterflies to continue proliferating.