Basic Pond Weed and Curly Leaf Pond Weed (Potamogeton) do grow in PA, in my pond.
It's only there during the spring & summer months, and early fall if it's does not get too cold
I don't think I would necessarily want to introduce it though. Over the last two seasons, it got way out of control in my pond. I have no clue as to why, especially considering that it was not a problem for the (4) years prior.
I had to get some Grass Carp to take care of it.
