I had this stuff growing in my fish tank. It was almost IMPOSSIBLE to get rid of. If I ignored it for more than 48 hours it would cover the tank. I've scooped it out and fed it to the chickens fresh, never thought to dry it. They LOVED it. I didn't know what it was at the time. It's nice to know that I wasn't poisoning them.
It's gone from tank (finally), but I'd love to start growing it outside.
Great idea. I had a friend give me three 55 gallon fish tanks in which I was going to do aquaponics never got to that. So I'll set them up and grab some duckweed out of the pond and get it started.