In Willapa Bay of Washington state, Sporobolus alterniflorus was probably an accidental introduction during oyster transplants during the nineteenth century and may have dispersed from there to other parts of the state. At its peak of infestation in 2003, it covered approximately 3,000 solid hectares (more than 8,500 acres), spread across an area of 8,000 hectares (20,000 acres). As of 2016, the infestation had been reduced to less than 3 solid hectares (7 acres).https://agr.wa.gov/plantsinsects/weeds/spartina/default.aspx, Washington State Department of Agriculture Spartina Eradication Annual Reports. Accessed 7/12/18.
