Class B Weeds Designated

Class B designated weeds are common in the county and are not designated by the State Weed Board to be controlled in that county, however the County has chosen to control these weeds and have included them on the County Weed List. Control in Snohomish County is required.

Common Name
Scientific Name
Knotweed, bohemian
Polygonum x bohemicum
Knotweed, giantPolygonum sachalinense
Knotweed, JapanesePolygonum cuspidatum
Loosestrife, purpleLythrum salicaria
Ragwort, tansySenecio jacobaea (view brochure (PDF))
Watermilfoil, EurasianMyriophyllum spicatum