Weed Categories
Submerged Native Aquatic Weeds
Examples: Large Leaf Pondweed, Water Nymph
The expected outcome for control of these weeds in unhealthy densities is to temporarily reduce the volume of the weeds. This is not a permanent fix. Think of it as “mowing” the grass as opposed to eliminating the grass. These weeds will grow back next season. However, if the same areas are treated each year, it is likely that there will be less weeds over time.
Invasive Weeds
Example: Fragrant Waterlily
The treatment for Fragrant Waterlily is systemic. The herbicide travels from the leaf down to the rhizomes (roots) and kills them. Treated areas should not regrow. The herbicide application must be done when the water surface is flat and calm. Wind or rain washes the herbicide off the plant leaf before it can be effective. Thus, weather is the wildcard for the timing of herbicide application.
Noxious Weeds
Example: Yellow Flag Iris (LINK)
Yellow Flag Iris is classified in Washington State as a Class C Noxious Weed. It is a non-native, potentially harmful, plant. It is recommended that landowners control it due to its aggressive spread and ability to outcompete native vegetation.
More Resources About Yellow Flag Iris
LAKE LAWRENCE VIDEO: Yellow Flag Iris is Dangerous – Control It! LINK
LAKE LAWRENCE VIDEO: Yellow Flag Iris control is your responsibility. LINK
PDF: Thurston County Noxious Weed Facet Sheet LINK
PDF: Control Options for Yellow Flag Iris LINK
OFFUT LAKE NEWS POST: April 2024: Help Remove Yellow Flag Iris LINK
OFFUT LAKE NEWS POST August 2024: Yellow Flag Iris LINK
LONG LAKE WEB POST June 2024: Yellow Flag Iris: A Beautiful but Risky Choice for Your Yard and Lakefront LINK
