California Invasive Plant Council

Heracleum mantegazzianum

Common names: giant hogweed

Heracleum mantegazzianum (giant hogweed) is a herb/ (family Apiaceae) with white flowers and large toothed leaves found in the northwestern ranges of Oregon. It is native to central Asia. It favors grasslands and riparian and bottomland habitat. It reproduces only by seed. Seeds fall within 13 feet of the parent plant and can be carried by water and wind. Sticky seeds attach on to humans, animals and machinery.

Cal-IPC Rating: Watch

CDFA Rating: A

Cal-IPC Assessment

Plant Risk Assessment - An evaluation of the potential for a plant to be invasive in California.

Weed Management Notes

• Management Notes - Information on management techniques and effectiveness from the University of California Cooperative Extension’s Weed Research & Information Center.

Cal-IPC Newsletter Articles

There are no newsletter articles associated with this species yet.

Cal-IPC Symposium Presentations

Presentations are linked where available. Where a presentation is not available, find more information by reading the abstract in the Cal-IPC Symposia Archive.

• Weed alerts and other invasive plant highlights for 2020. Burger, Jutta; Price, Robert (2020)
• 2019 Weed Alerts. Burger, Jutta; Price, Bob (2019)

Other Heracleum mantegazzianum Information

• CalPhotos - Images of plants taken mostly in California.
• USDA PLANTS Database - Federal database with information on identification and distribution, and links to websites in individual states.