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That is a type of milfoil, possibly Eurasian Water Milfoil. Bad for the pond, it will completely take over and is an extremely invasive species. To kill that plant and not any of the others, a 10 PPB dosage of Fluridone will kill it. It has to stay around 7-10 PPB for close to 30 days for it to be effective, so if you have water flowing through the pond it will be hard to keep that dosage rate. If there is no flow through I really like using Fluridone (Sonar A.S. or it's generic equivalent) as it only affects some invasive species at low dosage rates and does not affect native plants. I don't know of another systemic herbicide that will do that.

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This one I am not sure about as I haven't seen it before.


Potamogeton foliosus.could be correct, but any species of Potamogeton will be controlled (you can spot treat areas) with Aquathol K or Aquathol Super K

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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).