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Bittering Hops

It is the alpha acid contained in the lupulin of the hop cone that gives beer its bitterness. Varieties classified as bitter hops, typically have alpha acid levels of at least 8–10% of dry‐weight. Some bitter hops are classified as high alpha hops, because they have alpha acid levels as high as 18%.

The varieties Columbus, Tomahawk® and Zeus, collectively referred to as CTZ, are three of the key bitter hops grown extensively in the USA. The variety Pride of Ringwood is Australia’s most recognised bittering variety.