Pond Boss Forums AQUATIC VEGETATION Controlling unwanted plants How long will weeds continue to grow in deep water

Last Summer I rearranged my diffusers. When I went to pull up the weighted lines some of them were hard as heck to pull up because they were entangled in some kind of submerged vegetation that was still growing. I SHOULD have gotten pics to identify, but I did not. These lines were in 8' to 12' of water. I did not think plants could grow in water that deep with ~18-24" of visibility or less. The water was no where near that deep in the past. We raised it a total of 7'. 4.5' one year and then an additional 2.5' a year or two later.

Here is my question. Could those plants that grew around the airlines survive in 10' of water or was it their "last hoorah" from all the years they were established there when water was much shallower? I know it would help to know what type of plants. If they are there this Summer I will get pics for identification.