Pond Boss Forums AQUATIC VEGETATION Balance of plants in the environment Azolla in the north

Fairy moss, mosquito moss, or duckweed fern all names for Azolla. Has anyone colder than zone 7 tried this floating aquatic plant in their pond? I believe it's a type of duckweed but won't survive my winters. I don't know if it's capable of coming back and if so I probably won't try it. It uses phosphorus and fixes nitrogen. Fish are supposed to love it. Could I corral it in my pond and remove it in the fall?

I tried growing water hyacinth the same way but it was a disappointment, they did poorly. My water temperature might be too cool for them.

http://en.wikipedia.org/wiki/Azolla