FALLBROOK — Grangetto’s Farm & Garden Supply will host their Annual Horticultural Seminar, entitled “Sustainable Landscape Practices,” on May 13 at the San Diego Wild Animal Park. The seminar will run from 7 a.m. to 4:30 p.m. and feature speakers such as Gisele Schoniger from Kellogg Garden Products speaking on “Using Organic & Sustainable Practices to Build Healthy Landscapes;” James Downer, a plant pathologist with UCCE, speaking on “Using Organic Matter to Maintain a Sustainable Landscape;” a panel composed of Vince Lazaneo and Steve Dasher from UCCE; and Claire Ehrlinger...