You don't. You could use grass but you don't have to.
Fire and grass.
Alcohol + Grass = Absinthe
Any grass including cogon can be pulped using chemicals and once pulp, can be used for making paper without using used paper.
To make a waterproof mud you need poles, grass, cow dung and polythene paper. The grass which is usually properly woven and the polythene paper are used to make the roof waterproof.
Paper can and is made from grass, straws, cotton, bagasse, hemp etc.
Paper route, babysitting, running errands, cutting grass, doing chores.
There are several studies on axonopus compressus, also known as carabao grass, as paper. As paper, it has already been made into paper drinking straws, and packaging materials.
linen bond paper
Papyrus (a type of grass). Hence the derived name 'paper'.
grass , paper and etc
Food scraps Paper Yard waste (leaves, grass clippings) Wood Cotton