Golden-yellow” sisal twine is a strong, natural fiber cord made from the leaves of the Agave sisalana plant. It is widely used in agriculture, gardening, and crafting due to its durability, knot strength, and biodegradability.  is a strong, natural fiber cord made from the leaves of the Agave sisalana plant. It is widely used in agriculture, gardening, and crafting due to its durability, knot strength, and biodegradability.