Originally Posted by homebrewer_99
For a German HW: Hallertau, Spalt or Tettnanger.
Agreed, those are the most traditional, but with ~12 IBUs from a single addition at 60 minutes (traditional for the German examples) you can get way with pretty much anything relatively neutral.
Widmer uses "BITTERING: ALCHEMY AROMA: WILLAMETTE, CASCADE"
Alchemy is just what they call the blend of high AA% bittering hops they use.
Plenty more info on their's: http://www.widmer.com/beer_hefeweizen.aspx