Cultivated artichokes can revert to a wild, hard-to-control thistle form

The authors thank Dawn Lawson (Camp Pendleton), Ken Smith, Bob Clark and Jose Uribe (Orange County), Casey Jones (Alameda County), Joe Mraz (Solano County) for field tours. Walt Graves (San Diego County), Tim Gorden (Alameda County), Bart Hosman and Roger Epperson (Contra Costa County), Bill Tidwell and Deborah Hillyard (Orange County) provided distribution data. Grover Roberts (California Farm Bureau Federation) allowed review of a statewide questionnaire for estimated county acreage. This study was in part funded by the Public Service Research and Dissemination Program. Additional support was provided by the California Department of Food and Agriculture.