I find your duckweed to be very interesting
There is no duckweed in Iceland so I've never seen it
-but it looks really great in your pictures
After reading this thread, I realize it can be 'a problem' due to rapid growth - maybe it would suit perfectly in my cool climate
I remember reading somewhere that fish, especially Koi, eat Duckweed like snacks - maybe that is the reason there is so little of it in your large Pond Kaz?
..if only I had noticed this offer earlier .. and lived a little bit closer