Page authors: Don Knoke, David Giblin
Heracleum mantegazzianum
giant hogweed

Distribution: Occurring west of the Cascades crest in the Puget Trough lowlands in Washington; southwestern British Columbia to Oregon, also in eastern North America.

Habitat: Disturbed areas often associated with residential development; Class A noxious weed.

Flowers: June-July

Origin: Introduced from Eurasia

Growth Duration: Perennial

Conservation Status: Not of concern


[none provided]

Accepted Name:
Heracleum mantegazzianum Sommier & Levier
Publication: Nuovo Giorn. Bot. Ital. ser. 2, 2: 79. 1895.

Synonyms & Misapplications:
(none provided)
Additional Resources:

PNW Herbaria: Specimen records of Heracleum mantegazzianum in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Heracleum mantegazzianum checklist entry.

E-Flora BC: Heracleum mantegazzianum atlas page.

CalPhotos: Heracleum mantegazzianum photos.

USDA Plants: Heracleum mantegazzianum information.

10 photographs:
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