Appearance
''H. lupulus'' can grow to be 10 meters tall and because it is a perennial herbaceous plant it goes through several growing seasons sometimes living up to 20 years. ''H. lupulus'' has simple leaves that can be opposite or alternate with 3-5 lobes. The staminate flowers do not have petals, while the pistillate flowers’ petals completely cover the fruit. The cones found on female plants are called strobili. The fruit of ''H. lupulus'' is an achene, meaning that the fruit is dry but does not split open at maturity. The achene is surrounded by tepals and lupulin secreting glands are concentrated on the fruit.''H. lupulus'' grows best in the latitude range of 38°-51° in full sun with moderate amounts of rainfall. It uses the longer summer days as a cue for when to flower which is usually around July/ August.
''H. lupulus'' can cause dermatitis to some who handle them. It is thought that about 1 in 3000 people are affected by this.
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