1305M325R0009_PWS_A4c.pdf

This is an informational document (Attachment 4c) about Yellow Flag Iris (Iris pseudacorus), a Class C noxious weed, provided by the Washington State Noxious Weed Control Board. The document appears to be included as part of a landscaping services solicitation for NOAA's Montlake Laboratory.

The document details the identification, characteristics, and control methods for Yellow Flag Iris, which is listed as toxic to humans and livestock. It is described as an invasive ornamental perennial growing 2-3 feet tall in wetland areas, with pale to dark yellow flowers and sword-shaped leaves. The document outlines three control methods: mechanical (careful removal of rhizomes), cultural (burning), and herbicide control (cutting stems and applying appropriate herbicide). The plant reproduces through seeds and rhizomes, with the ability to spread extensively in temperate wetlands along lakes and slow-moving rivers. This technical information would be relevant for contractors performing landscaping services at the Montlake Laboratory site to identify and properly manage this noxious weed.