Common names: giant ragweed
Ambrosia trifida (giant ragweed) is an annual herb/ (family Asteraceae) with a long cluster of green-yellow flowers and opposite leaves found in the central western and southwestern areas of California. Giant ragweed has both female and male flower parts. It is native to the central and eastern United States. It favors grasslands. It spreads via seeds, and easily resprouts after being cut.Rating: Watch
- Plant Risk Assessment - An evaluation of the potential for a plant to be invasive in California.
- Cal-IPC News - Our quarterly newsletter. Each issue is available as a pdf.
- Cal-IPC Symposium Proceedings - Presentations and papers from our annual Symposium.
- Don't Plant a Pest! - Select your region to find non-invasive alternatives to ornamental species. Also see our statewide brochure on trees.
None for this species.