This rural, 160-acre, Washington County prairie is a rare, pristine area, abundant with native plant species that are generally not found nearby, due to urban encroachment and human modification of plant life. Unusual for the Tualatin Basin, the acreage supports an important remnant population of the rare native herb, Rydberg’s penstemon, and a large legacy camas lily population that is especially significant to members of the Native American community, who collect, prepare, and cook the bulbs on site. To preserve this diverse and unique wetland prairie, Green Banks' staff scientists were called upon by Metro to control several problematic weeds, including pennyroyal, foxtail, and velvet grass. Oregon ash trees, which are considered weeds in prairie areas, were also controlled. Crucial elements of our management strategy included ensuring thorough coverage by frequent surveying of the site, implementing weed control, and maintaining recently planted areas. Green Banks’ vegetation management focused on hand pulling weeds and Oregon ash tree seedlings, rather than using pesticides, to keep the area as pure as possible for the Native American community who consume the camas lily bulbs. To further sustain the native species, Green Banks was also contracted to collect native plant seed from the site for Metro’s native plant materials program.