It's possible to make usable rope from leaves, believe it or not! You'll want to choose fibrous ones, like maybe yucca or cattail. They work best dead, but they'll work when green, too.
This is an example of what you can make! It doesn't take much effort, either.
And this is how you do it! You just reverse wrap it, and once you finish, you'll wind up with great, pretty reliable rope that can be very useful in survival situations. Pretty easy, right? Give it a try!