University of California
Master Gardeners of Shasta County
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LinkedInIntegrated Pest Management Weed Identification
Try these websites from UC Davis to identify your weed:
Weed photo gallery / All Weeds
Don't Plant a Pest!
Alternatives to invasive garden plants. Use the Central Valley link for the Valley areas of Shasta and Tehama Counties.
Try "Id'ing them yourself: WEED ID TOOL