Hops provide bitterness to balance the sweetness of [[Malt]] when making beer, adds flavoring oils and aromas, and also helps to stabilize and preserve beer. Hops used in brewing comes from the flowers of a plant called ''Humulus Lupulus''. The hop plant is a perrenial spiraling vine that requires most soil. The flowers of the hops, called ''cones'' are dried before use. These flowers are usually green in color with yellow ''lupulin'' glands between the petals that provide many of the oils.