Cluster Hops – 
Believed to be one of the oldest American hops used in mass beer production. This translates to varieties were likely transported from Europe, potentially by the Dutch and English settlers, and after years of growing, hybridization, likely open pollination, a strong sample was chosen and given the name Cluster. Double Mountain Cluster

Cluster Hops is not grown in the capacity as it once was, it has faced a similar fate as many other varieties falling to the shadows of the super alpha varieties, and those with more disease tolerance. However, Cluster hops is still widely available, and makes a great dual purpose hops in homebrews and commercial beers. The alpha acid content of Cluster Hops is 5.0%-8.5%. The bitterness from this variety is not overwhelming, and is balanced with its floral flavor and aroma.

Beers made with Cluster  –
Double Mountain – Cluster F#ck (Single Hop IPA)
Almanac Brewing – Fresh Hop IPA
Mikkeller APS – Fresh Hop IPA
Anchor Brewing – California Lager