Thanks everyone for the conversation. It's always educational. Based on this info I'm not going to stock GSH. I'm going to do my best to source SFS and/or BNM. Worst case I'll try to harvest some from wild near my house.
When harvesting forage from wild, are their concerns and/or best practices to ensure I'm not introducing 'things' into my pond from wild that I wouldn't want in there?
Since I'm lazy... I'm going to try to find a source rather than wild harvest... but...
