Anthropic, Al (Fireishot) posted a while back, of a place in the DFW area, where waterlilies with reduced spreading tendencies might be purchased. Maybe he will pass along the name of the business again. or you maybe could pm him for the info. And my water celery did not survive, I figure reduced light in a fertilized pond is why it did not take. Reduced light penetration = plant dies, I knew that if I would have just thought about it before spending the $$

DA on my part. And JDM is right on with the Louisiana Iris, has done well at my pond along with Blue Flag Iris. American Pondweed 2 plants out of approx. $600 worth survived.

Better than none, I guess. And nothing from MN has come to the pond waters, so I might be lucky there.
Tracy