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The City of Portland, Oregon

Environmental Services

working for clean rivers

Phone: 503-823-7740

Fax: 503-823-6995

1120 SW 5th Ave, Suite 613, Portland, OR 97204

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What does it look like?

Giant hogweed is very tall. Plants typically grow to 10 to 12 feet tall, or more. Leaves can be up to four feet wide, with heavily-toothed edges and deep lobes. Plants tend to have a very large central seedhead (18-24 inches across), with several smaller seedheads in orbit around it. The hollow stem is covered with dark purple blotches, especially near the base, each with its own tiny hair.

hogweed central seed head

hogweed central seed head

hogweed leaves

leaves with jagged edges

hogweed stems

blotches and hairs on stems