I don't know if Preen is labeled for use around ponds. That only stops seeds from germinating, if the plants come back from roots or grow from rizomes, Preen won't work.

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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).