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As I was preparing to prune my h. polysperma (yet again), I was
entertained by the amusing thought that if hygrophilia or duckweed were
edible, one could feed a small town from a 20 gallon tank. This led me to the
realization that I had no idea which, if any, of our aquatic plants might be
edible. I wonder if some of the more experienced aquatic gardeners would care
to comment on this aspect of our hobby.