When we talk about ornamental grasses, we refer to plants with a grass-like appearance and actual grasses. As this term hints, these grass types are known for being used in landscaping due to their exciting textures, colors, etc. Most of these grasses are considered perennials. However, they can be annual, too, especially if they aren't hardy enough for the climate in which they grow. Their growing habits allow us to divide them into two categories: spreading and clumping. Spreading ornamental grass can expand fast by its stems. Be careful when you opt for such grass type: it can overtake other plants in the garden. Clumping grasses – as the name suggests – grow in a clump.