Perle Hops - Dried Leaf 100g An American hop with a high Alpha Acid content and a pleasant, herbal flavour. £6.25 Quantity: at £6.25 each Add To Basket 2 in stock. An American hop, similar to Centennial, which is noted for its herbal flavour and its strong bittering qualities. It is often used as a substitute for Centennial hops. Its typical alpha acid levels are 14-16% depending on the harvest, so you may need to adjust the amounts used in your recipe to ensure that you match the target EBU value. Our current crop have an alpha acid level of 14.5%, so you will need to use much lower quantities than your recipe would suggest.