Strange Stones VII

Beatrix got another clue. It's secondhand and unverified, but Vincent really believes it. So it should be as good as the clues for the other stones. Vincent heard from a brewer, sometime during his travels, he wouldn't say where, that the secret to his incredible ale was a stone that he found in a bag of hops. Vincent said the ale was easily the best he ever had. Beatrix would like you to try harvesting some hops.