Bitter Hop. Cluster is one of the oldest varieties in the U.S. The rootstock origin is uncertain. Until the late 1970’s, Cluster was one of only a few varieties grown in the U.S. and dominated the growing acreage. Alpha acids content is medium, aroma is strong and storage stability of the alpha acids is among the best in the world. The variety grows with good vigor and cone production.
Cluster pellet hops by Willamette Valley Hops