Aquatic Weed Management

We have expertise controlling Purple Loosestrife, Salt Cedar, Japanese Knotweed, Yellow Flag Iris, St. Johnswort, Canada Thistle, and blackberries in riparian areas. These destructive invasive plants replace native vegetation by out-competing them. When this happens, wildlife such as fish, birds, animals and insects that depend on native plants slowly disappear and the character of riparian areas is forever altered.

Treating riparian areas often proves difficult due to access, the permitting process, and water quality issues. To treat riparian sites applicators must be licensed by the Washington State Departments of Ecology and Agriculture, and the herbicides must be registered for aquatic use. Control techniques in riparian areas vary. The most common controls are spot spraying with herbicides and employing biological organisms.