Jaymz, welcome to PB! I'm not an expert on plant control so don't take what I have to say as gospel. I think you have to wait until the WM is growing, and then you have to keep the concentration of floridone in the correct range for a certain length of time for it to work.

Ain't that duck trying to swim upside down?? wink

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3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).