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The witch made a potion for the mermaid that could be used against polyps. So it is quite possible that the witch made this concoction and used it against the bush.
Anyway, I don't know, but it doesn't seem that way to me yet, Hermit.
It would have been in the newspaper if it was a potion or a decoction... my first associations would also be with a witch.
And where did the ornament come from then?... (this is just a rhetorical question). But Vish, in principle, has both an ornament and a cup with something (presumably with a concoction :D) in his avatar. Therefore, my vote is still for WishmasteR's execution. Although I doubt it, two pieces of evidence, is that too much? But! The Oracle is silent in this case. Usually, he is more talkative.