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Giant hogweed has serious health risks

by: CONTRIBUTED PHOTO - Giant Hogweed can cause severe burns. Though this plant resembles other plants with white umbrella-shaped flowers and lacy leaves such as Queen Annes lace, Cow Parsnip and Poison Hemlock, Giant Hogweed is unique in that it grows 10-15 feet high in months. Please report any suspected sightings the Clackamas County Soil & Water Conservation District or the Oregon Invasive Species Hotline.The Clackamas County Soil & Water Conservation District has issued a warning that giant hogweed (Heracleum mantegazzianum) is proliferating in Clackamas County due to seed spreading and the sharing of plant starts.

But Giant Hogweed is no asset to a garden as it causes severe burns and, in some cases, blindness.

Also, according to the Clackamas County Soil & Water Conservation District, the plant is “prehistoric in appearance” and can grow 10-15 feet high in months.

The plant is called a “public health hazard” on the Oregon Department of Agriculture website.

Local, state and federal weed control programs are attempting to eradicate giant hogweed infestations from the region.

Please report giant hogweed sightings to the Clackamas County Soil & Water Conservation District by calling 503-210-6000 or by sending an email to This email address is being protected from spambots. You need JavaScript enabled to view it. or call the Oregon Invasive Species Hotline at 1-866-INVADER.




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