The hop is a hardy, perennial plant which produces annual vines from a permanent root stock. Vines may grow up to 25 feet in a single season but will die back to the crown each fall. In addition to the true roots and aerial vine, the crown also produces underground stems called rhizomes. Rhizomes resemble roots but possess numerous buds and are used for vegetative propogation. Thus propogated all plants of a given variety are genetically identical. Only the female plant produces the flowers that are used for brewing or medicinal purposes. Hops can be grown in most any state in the USA. Plant between March and May. Under good condition hops are a prolific vine and will produce between 1/2 to 2 lbs per pound per year.