Dietary fiber or roughage is the indigestible portion of food derived from plants. It has two main components: 1  Soluble fiber, which dissolves in water, is readily fermented in the colon into gases and physiologically active byproducts, and can be prebiotic and viscous.
Usage. If the willow tree is small, apply the herbicide as a foliage spray covering the willow's entire foliage until the chemical begins to drip off the leaves. For larger willow trees, cut the upper and lower branches off with a chainsaw and cut the trunk as close to the ground as possible.
Growth Rate. The weeping willow is a rapidly growing tree, which means it is capable of adding 24 inches or more to its height in a single growing season. It grows to a maximum height of 30 to 50 feet with an equal spread, giving it a rounded shape, and can reach full growth in as soon as 15 years.