Land Plants - native

Cow Parsnip (Heracleum maximum) on May 25, 2023

Originally reported as Giant Hogweed (Heracleum mantegazzianum)

Submitter does not have a specimen

Description of specimen

See attached photos. Also saw a similar plant, but with different foliage, which I am less sure about.

Commentary

None

Resources

Information on Cow Parsnip from iNaturalist and OregonFlora.

Location

Off Hwy 101 on the Oregon Coast, Giant Hogweed spotted in a couple of places: right next to the trail leading from the parking lot at Cook's Chasm down to the viewpoint for the Spouting Horn and Thor's Well; on the switchbacks of the upper trail leading down to Devil's Churn from the lower visitor parking lot - before reaching the stairs.

Expert Reviewer

Troy Abercrombie
Oregon Dept. of Agriculture
Noxious Weed Program Manager

© 2025 Portland State University | Contact us for questions regarding site content