Columbus hops This dual purpose hop is a high alpha varietal with a neutral bitterness and intense aroma. Floral and citrus notes come out in both aroma and flavour, but can be very pungent, which makes Columbus great for late additions to a boil or dry-hopping. Columbus is a perfect choice for IPAs, Pale and Imperial Ales. Also referred to as Tomahawk, Zeus, or CTZ. Style Guide Imperial Brown Ale, Barley Wine, Imperial Stout, American Ales, Stout Hop Statistics Alpha Acids: 14.0 – 16.0% Beta Acids: 4.0 – 5.5% Alpha-Beta Ratio: 2.55 - 4 Cohumulone: (% of alpha acids): 30 – 35% Total Oils in mls per 100 grams dried: 1.5 – 2.0 Storage(% alpha acids remaining after 6 months storage at 20° C) 45 - 65% Similar Hop Varieties Chinook, Nugget, Millennium,