Yes, like pond algae, you can compost duckweed.
Duckweed, or water lens/water weed or bayroot, is often the bane of pond owners because oh my, can it spread quickly.
However, it is a great addition to compost heaps – its heavy nitrogen load means it’s a great activator for compost heaps filled with lots of browns, like sawdust, dried leaves or cardboard. (Conversely though, if you’ve got lots of duckweed to do away with, mix it in with some of those browns – it’ll help it rot down quicker.)
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