Cluster is the oldest variety grown in the U.S. Origin of the rootstock is uncertain. Until the late 1970s, it was one of only a few varieties growing in the U.S. Excellent general purpose hop with medium and well-balanced bittering potential. This hop leaves no undesirable aroma properties. Good for dark beers with roasty and chocolaty aromas. Alpha acids content is 5.5-8.5%, aroma is a strong floral. It has Bittering with good flavor.