Well, JW, duckweed is so easy to find in ponds, you can get a fresh supply next year, or this fall on your walks maybe.
I can't put Miracle Gro in the Azolla in the bog, cause that goes into the pond. I could put it in the kiddie pool, though, although would have to dump most of the water. It's to the top full from all those rains we had the last 3 weeks. I heard that it likes the muck in the bottom of those kiddie pools, gather from dust and dirt and leaves, etc. throughout the year, so was hoping it would do well, but maybe it got too much fresh water and not enough muck. It still has some in there, but it's not multiplying like the stuff in the bog.