Spin Grass Roots
Select a clump of grass to pull, and wash off it's roots.
Pull apart the clump, contuinuing to wash the dirt from the roots. Using scissors, clip off all of the grass that was growing above ground.
Using a drop spindle, draw all of the roots out into a twine. To prevent molding, be sure to dry it thoroughly if you don't intend to weave it right away.