A noxious weed is a plant defined as a pest by law or regulation. All of the designated noxious weeds are invasive and need to be eradicated or controlled. The California Department of Food and Agriculture (CDFA) has compiled a noxious weed list and assigned a rating to each that reflects the statewide importance of the weed, the likelihood of successful eradication, and it’s present distribution. The revised language of the rating policy assigns a rating of A, B, C, Q, D, and W.
Contra Costa County Department of Agriculture is committed to eradicating all weeds within its borders with an "A" or "Q" rating. We also control specific weeds with a "B" rating. Although we devote little effort to "C" rated weeds, we strongly encourage landowners to control any noxious weeds existing on their property.
Artichoke thistle, which is the wild form of the cultivated artichoke, is a noxious weed found in Contra Costa County. It invades rangeland and wild areas. When left uncontrolled, it can choke out native plants and reduce the grazing value of rangeland.