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Taxon  Report  
Heracleum mantegazzianum  Sommier Levier
Giant hogweed
Heracleum mantegazzianum is a perennial herb that is not native to California.
There is a high risk of this plant becoming invasive in California according to Cal-IPC.
Siskiyou Del Norte Modoc Humboldt Shasta Lassen Trinity Plumas Tehama Butte Mendocino Glenn Sierra Yuba Lake Nevada Colusa Placer Sutter El Dorado Yolo Alpine Napa Sonoma Sacramento Mono Amador Solano Calaveras Tuolumne San Joaquin Marin Contra Costa Alameda Santa Cruz Mariposa Madera San Francisco San Mateo Merced Fresno Stanislaus Santa Clara Inyo San Benito Tulare Kings Monterey San Bernardino San Luis Obispo Kern Santa Barbara Ventura Los Angeles Riverside Orange San Diego Imperial
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Bloom Period
Genus: Heracleum
Family: Apiaceae  
Category: angiosperm  
PLANTS group:Dicot
Jepson eFlora section: eudicot

Wetlands:
Arid West: Occurs usually in wetlands, occasionally in non wetlands
Mountains, Valleys and Coast: Equally likely to occur in wetlands and non wetlands

Communities: Yellow Pine Forest, Red Fir Forest, Lodgepole Forest, Subalpine Forest, Foothill Woodland, Chaparral, Valley Grassland, many plant communities

Information about  Heracleum mantegazzianum from other sources
USDA PLANTS Profile (HEMA17)

Photos on Calflora

Photos on CalPhotos

Google Images

Photos on iNaturalist

[Wikipedia] Eurasia native: Giant hogweed is native to the western Caucasus region of Eurasia. It was introduced to Britain as an ornamental plant in the 19th century, and has also spread to other areas in Western Europe, the United States, and Canada. (contributed by Mary Ann Machi)

[Cal-IPC] Invasive: 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. (contributed by Mary Ann Machi)


Suggested Citation
Calflora: Information on California plants for education, research and conservation, with data contributed by public and private institutions and individuals. [web application]. 2024. Berkeley, California: The Calflora Database [a non-profit organization]. Available: https://www.calflora.org/   (Accessed: 05/25/2024).