Processing and spinning vegetable fibers is very different then working with animal fibers. Even the processing techniques for different types of fibers can vary widely. In some cases you are taking fiber off the leaves (Sisal), in others you are taking it off the seeds of the plant in the form of bolls (Cotton). For flax, hemp, and nettle you are taking the fiber from the outer section of the stem, called the bast. These fibers are called bast fibers.