I just wanted to share nature winning. This plant ("broadleaf arrowhead" I believe) has been a champion. I got it for a pond experiment and it ended up struggling. When I tore down the "pond" I put one little bulb (all that was left) of it in some grow media on my fish tank but it never did much there. I ended up tossing the media into my second tote-pond and that spring, to my surprise, leaves sprouted in two arias where a shoot had been sent. They all died over winter and the top water froze briefly so, please imagine my surprise when I find a half dozen shoots breaking the surface in arias where It seems to have spread.
TLDR; If you want a pond plant get a broadleaf arrow head, they are apparently "bullet proof"
PS. Any garden credit goes to my amazing wife.