This video demonstrates how to make a string or cord using a yucca leaf for fibers. You can you this same technique on other long leaf plants and on stalks such as thistle and milk weed.
Demonstration of how to make a bow drill fire from all natural materials using a piece of a pine knot, cat tail stalk, a willow limb, a random stick and a yucca leaf. I came up with a unique way to provide tension on the string without breaking the cat tail drill using a finger loop.
Making a fire using the sun a soda bottle, reading glasses and magnifying lenses.
Demonstration of making a friction fire using the hand drill method

Demonstration of making cordage from bark.

Describes how to remove bark from limbs and how to twist the fibers to make cord.