Pond Boss Forums AQUATIC VEGETATION Controlling unwanted plants Milfoil and Clipper

Don't rake out the milfoil. If the plant is broken into pieces, all those pieces could take root and start growing. Anytime the water temp is above 60°F and climbing or staying steady will work. BUT I wouldn't treat it if the water temp is in the 80's or higher, when they die they will start to decompose and the decomp process uses O2, which is in shorter supply the hotter the water is. TJ is correct, treating it later in the year makes it harder to kill. If the plants have some algae growing on them, the algae sucks up some the herbicide making less available to kill the milfoil.

The one thing about flumioxazin, unlike fluridone, is that you have to watch the pH of the water. Flumioxazin doesn't work as well in water with higher pH levels.