Hemp (cannabis sativa) is one of the most important natural
fibers. Hemp crops require virtually no chemicals in their production,
since they are naturally resistant to most pests. On the other
hand, cotton accounts for approximately 50% of all pesticides and
herbicides used in U.S. agriculture today. In addition, hemp produces
significantly more fiber per square meter than cotton or flax
and uses less water to grow. Hemp fiber is naturally antimicrobial
and resistant to ultraviolet light, mold, mildew, and insects, which
makes it of potential use in outdoor applications. The United States
is one of the largest consumers of hemp fiber in the world, although
its cultivation is illegal in the U.S.