In this Home & Garden video tutorial you will learn how to divide ornamental grasses. Daryl Beyers in this video says that spring is the right time for this activity and you'll need a sharp knife or, even a chain saw for this. When a bunch of grass starts to become sparse in the middle, it's about time to divide. The first step is to dig the entire grass out of the ground. It will take some amount of effort to do this. After this is done, take a sharp knife or a chain saw and divide the bunch in to six or seven smaller bunches. Now you dig pits where you want to relocate the grass and replant them. This whole activity is a bit of a tough job to do.