Wilbur Packing Company Wilbur Packing is located in the heart of prune country Californias fertile, sunny Sacramento Valley. The Wilburs have been farming in the Yuba City area... since 1869 and were among the first to offer sweet, nutritious California prunes. Today, Wilbur Ranch plants its 3000 acres 50-50 with the best prunes and walnuts on the globe... and it remains one of the largest family-owned prune producers anywhere. Copyright 2013 Wilbur Packing Company, Inc. All Rights Reserved. ...