Contrary to popular belief, banana plants are not trees but giant herbs, which reach their full height of between 10 and 20 feet after only a year. Every banana blossom develops into a fruit, which is ripe enough for consumption after about three or four months. After producing fruit, the plants' stems die off, and are replaced by new growth. The number of bananas produced by each plant varies. However, ten or more bananas growing together forms a "hand." Banana stems have on average 150 "fingers" and weigh nearly 100 pounds. The trunks of banana plants are not woody but composed of sheets of overlapping leaves wrapped tightly around one another, a design feature that enables them to conserve water. Because banana plants are approximately 93 percent water, even moderate winds can knock them down and destroy entire plantations.