Humulus lupulus is the hop plant, grown for beer-making. It has deeply toothedand these, and its , are slightly prickly and adhesive. This helps it to climb. Male and female , both green, are produced on separate plants. It is a , and climbs up to 6 m (20 ft) by twining.
H. japonicus, the Japanese hop, grows even faster— 9m (30 ft) or more in a summer. It is not usually hardy in this country, and is best gown as an. It is good for giving quick cover for an ugly fence or building. It flowers from July to September. General care: Humulus likes a well-manured, well-drained soil, in sun or semi-shade. Provide vertical support for climbing.
Propagation: Sow thein spring where the plant is to grow.
Pests and diseases: Powderycan be treated by dusting with sulphur.