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?
Plant Risk 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
- Impressions from north of the border: Oregon's 2022 Interagency Noxious Weed Symposium. Burger, Jutta. Vol 31, Issue 1
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.
- 2019 Weed Alerts. Burger, Jutta; Price, Bob (2019)
Other Heracleum mantegazzianum Information
- CalPhotos - Images of plants taken mostly in California.
- CalWeedMapper - Distribution map of this species in California with ability to determine regional priorities.
- EDDMapS - Distribution of this species in North America.
- USDA PLANTS Database - Information on identification and distribution, with links to websites in individual states.