Which of the following is NOT a high alpha acid hop?

Cascade is not classified as a high alpha acid hop. High alpha acid hops generally have an alpha acid content exceeding 10%, which is typically sought for their ability to provide bitterness to beer. Cascade, while a popular hop variety, usually has an alpha acid content ranging from about 4% to 7%. Its appeal lies more in its aromatic qualities, providing floral and citrus notes, rather than in high bitterness contributions.

In contrast, Bravo, Calypso, and Citra are considered high alpha acid hops, often used for their significant bitterness and complex flavor profiles. Bravo can have alpha acids ranging from 13% to 17%, making it a strong contender for bittering. Calypso generally sits around 10% to 12%, while Citra typically has levels around 11% to 14%. This distinction is important for brewers, particularly when considering hop selection for specific styles of beer and desired bitterness levels.