Abstract
The cultivated hop (Humulus lupulus L.) is a dioecious plant of the Cannabaceae family, which is grown in most of the temperate climate zones of the world. The day-length requirements, related to the amount of light hops needed during the growing season for flowering, restrict commercial cultivation of hops to a latitude between 35° and 55° in both hemispheres. The main commercial cultivars of interest to the worldwide market are grown in Europe and the North-west region of the United States of America in the Northern Hemisphere, and in Australia, New Zealand, and South Africa in the Southern Hemisphere. The most important commercial hops (ca. 40 varieties) are all cultivars of the Humulus lupulus L. species (table 1). The only other species, Humulus japonicus L., is an ornamental plant. Wild hops are found ubiquitously.
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