Ornamental grasses are very easy to propagate from root divisions.
Early spring is the best time of the year to propagate your ornamental grasses. During February or March, you should cut your ornamental grasses back to ground level to make way for new growth. As new growth begins, or even before you see those new sprouts, the grasses will be easy to manage so that you can dig and divide them to create new plants. To propagate your ornamental grasses, you can use one of two methods. The easiest way to get a new start off an existing ornamental grass clump is to use a pickaxe to chop off pieces of the root system.