He needs to head to the Hallertau region just north of Munich for hops. There's a Friedburg north of Frankfurt and one in Bavaria.
If he drives along the Deutche Hopfenstrasse
, he'll come across loads of hop farms. It starts in Freising (home of Weihenstephaner Bier) and heads north on the B310 for about 50 klicks.
I did a drive there back in June during Hop Harvest. What a hoot, but the dialect was a bit difficult, but we managed...