"Willow bark?" Geralt shrugged one shoulder. "I would use it for localized swelling. An injured joint, something like that." As it became clear that Jaskier was at least able to discourse about such things instead of just sit and sop up dry information, the taciturn edge left his voice... and maybe, maybe there was a bit of amusement hidden beneath. The idea of Jaskier peeling willows was just too good. He wondered if whoever They were had just done it to keep Jaskier's undoubtedly nervous prattling out of the house.

"--told you it was what?" His head lifted at that, hair falling down in front of his shoulders and eyebrows knitting together. "Wormwood does promote..." he cleared his throat. "It draws blood to the surface, so technically it can help with healing and clotting, yes, but I wouldn't say that it's the thing that it's most known for." For a moment, Geralt puzzled on it, and then he realized; "the marshes. It grows like a weed in wet conditions. No wonder they'd use it over something else."