In Belgium the young, tender tops of the plants are cut off in the spring and eaten like asparagus, especially recommended to the pale and anaemic and those with scrofulous taints.
The peculiar hop-like fruiting known as strobiles are collected in the fall of the year (September to October), dried and tightly packed into bales. The base of the scales of the strobile are covered with a yellowish powder, consisting of resin-bearing glands, known as lupulin. One pound of hops yields about one ounce of lupulin. Since the medicinal virtues of hops reside in the lupulin it will be readily understood that the hops from which the glands have been removed is of little or no medicinal value. Lupulin as well as the hops have a faint, peculiar, somewhat yeasty odor, which increases with age due to the development of valerianic acid. For medicinal purposes only fresh hops should be used.
The principal use of hops is in the manufacture of beer, to which it imparts the peculiarly bitter taste, and its repute as a tonic. For this purpose enormous quantities are consumed in Germany and England. The exhausted hops from the breweries form an excellent fertilizer for light soils. The leaves have been used as fodder for cows. Leaves, stems and roots possess astringent properties and have been used in tanning. In Sweden the fibre of the stems is used in manufacturing a very durable white cloth, not unlike the cloth made from hemp and flax.
Hops is used medicinally. It at first causes a very slight excitation of brain and heart, followed by a rather pronounced disposition to sleep. Pillows stuffed with hops form a very popular domestic remedy for wakefulness. Hop bags dipped in hot water form a very soothing external application in painful inflammatory conditions, especially of the abdominal organs. It has undoubted value as a bitter tonic in dyspepsia and in undue cerebral excitation. Tincture of lupulin and red pepper (capsicum) enjoys the reputation of being a very efficient substitute for alcoholic stimulants when their use is to be discontinued. Earlier physicians recommended hops very highly in kidney and liver complaints, as a "blood purifier" and to cure eruptive skin troubles. It is recommended in nervous troubles and in delirium tremens. The roots were formerly employed as a substitute for sarsaparilla.