One of the most common questions people have about ornamental grasses is “How do I cut them back?.” But the answer to this question is not as simple as it seems. As it turns out, there are two different answers to this question. The answer depends on whether the grass you have is a warm or cool season grass. So in this article, we will explain the difference between the two and tell you how to care best for each. Of course, we will be only covering perennial grasses. Annual grasses should be removed at the season’s end after they no longer look good or the frost kills them.