Sustainably Grown. California is a world leader in sustainable winegrowing with the majority of winegrape acreage and production, including Zinfandel, assessed to California’s Code of Sustainable Winegrowing which establishes best practices in sustainability from ground to glass. An increasing number are also verifying practices with sustainable certifications such as California Certified Sustainable Winegrowing (CCSW), Lodi Rules, SIP Certified and Napa Green.