Unknown weed

Asked June 10, 2020, 12:05 PM EDT

Please advise the proper name of this persistent weed. Is it part of the Knapp weed family? Thank you

Marion County Oregon

1 Response

Thank you for contacting us with your weed question. I believe you have a bull thistle (Cirsium vulgare), a biennial weed. The flattish rosette is first-year growth. In the second year, the plant develops a tall stalk before flowering.

This weed is controlled by pulling or cutting repeatedly until the root dies from being deprived of energy from photosynthesis.