Any idea why Wisconsin would ban water hyacinths? I always had some in my water garden . Helped keep the water clean . I do realize it is an invasive plant down south , but it is tropical and dies in our winters .
I think you should trust the DNR staff on this one. Afterall if their research isn't trusted and followed it would only be right to thin their ranks and insvest the money elsewhere.
I just threw it on the lawn , and mulched it with the mower . No standing water for over a half mile .
You answered your own question - they are invasive and have been found on Wisconsin waters and surving the winter.