According to research conducted by ESPM Professor Gordon Frankie as well as Kremen, the solution may be your garden. Urban and suburban gardens can provide refuge for native species of wild bees driven from their natural habitat.
Frankie has identified 40 different species visiting the small garden of bee-attractive flowers that he and his students planted on the Berkeley campus, and they have identified a total of 82 species within the area.
More information about urban bee gardens is available on Frankie’s website.