Bill, Thanks I will have to check out the MSU Extension for some information but I think that is a very vague description on their part. I live in the southern UP and we call it the banana belt down here. we do no get any lake effect down here. I run an aerator and have fresh water flushing the pond 24/7. When I figure out how to upload pictures I will post some pictures of my weeds. Journey Man, I agree it looks like mill foil but the "leaves" are not the same. I cannot fins a picture of it anywhere online.