HOUSTON, LAGUNA BEACH, Calif., & SAUSALITO, Calif.--SWA Group, one of the world’s leading landscape architecture, planning and urban design firms, announced today its work on 7,250 homes in six innovative master-planned housing communities integrating home design with the natural settings, in some cases using “workhorse” natural systems to cleanse polluted run-off, enhance storm protection and expand native plant and animal habitat while creating amenities for residents.