The available hemp rope for sale is made from a Sativa which is a species of the Cannabis genus of plants. These plants grow quickly and their length can reach more than 15 feet high. The fibers used to make hemp rope are known as "bast". It is the part of the plant that grows under the outer layer of bark and surrounds the inner stalk. These fibers have excellent strength and are long, running the length of the plant. Numerous singular hemp fibers are interweaved or twisted together to form a hemp rope.