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Tualatin Riverkeepers seek volunteers for hogweed hunt

by: Submitted Photo, A member of the carrot or parsley family, giant hogweed grows 10 to 15 feet tall. The white flowers are on a large umbrella-shaped head that can be nearly 3 feet in diameter. Hogweed blooms mid-May to July.

Tualatin Riverkeepers is working with the Oregon Department of Agriculture to survey the Tualatin River around the mouth of Fanno Creek for giant hogweed. The Riverkeepers will provide six canoes for 'weed watchers' to participate in this survey. Paddles and personal flotation devices will also be provided.

The survey will take place from 4 to 6:30 p.m. Wednesday, June 13, at Cook Park, 17005 S.W. 92nd Ave., in Tigard.

A member of the carrot or parsley family, giant hogweed grows 10 to 15 feet tall. The white flowers are on a large umbrella-shaped head that can be nearly 3 feet in diameter. Hogweed blooms mid-May to July. The plant also has a stout dark reddish-purple stem and spotted leaf stalks.

The Oregon Department of Agriculture has been working on eradicating an outbreak of giant hogweed on Fanno Creek for about a decade. The goal of this survey is to check if hogweed has spread from Fanno Creek to the Tualatin River.

The Riverkeepers say people should be cautious with touching hogweed as its sap may cause serious burns to the skin when exposed to sunlight. The Oregon Department of Agriculture and city of Tigard are working to eradicate hogweed from lower Fanno Creek.

There is limited space in canoes, so participants must pre-register by sending an email to This email address is being protected from spambots. You need JavaScript enabled to view it..

A paddle trip waiver must be filled out and brought with participants for the June 13 event.

For more information about the survey or the Tualatin Riverkeepers, call 503-218-2580.