1305M325R0009_PWS_A4a.pdf

This is an informational document about Purple Loosestrife (Lythrum salicaria), which appears to be Attachment 4a of a Performance Work Statement for landscaping services at NOAA's Montlake Laboratory. The document is a King County Noxious Weed Control Program weed alert that provides detailed identification and control guidance for Purple Loosestrife, a Class B Noxious Weed requiring mandatory control.

The document details the plant's characteristics (tall magenta flower spikes, 6-10 foot stems), biology (produces up to 2.5 million seeds per plant, 20-year lifespan), and control methods including manual removal, mechanical controls, and chemical treatment options. It emphasizes proper disposal procedures, prevention methods, and distinguishes Purple Loosestrife from similar-looking native plants. The document includes specific guidance for treating infestations in wetland areas and requirements for herbicide use in sensitive aquatic environments, which would be relevant for landscape maintenance near waterways or wetlands on the Montlake Laboratory property.