Are all ornamental grasses really grasses? Not really. The term “ornamental grass” is often used as an umbrella term to group together multiple perennials with a grass-like appearance, including true grasses, sedges (Carex), and rushes (Juncus). Horticulturists use the phrase “sedges have edges, rushes are round, and grasses have nodes from top to the ground” to remember their distinct stems.

Other than stem shape, there are a few key differences between the three groups. Unlike most grasses, sedges grow well in shade and can tolerate moisture, making them popular additions to wet-shaded sites. They’re semi-evergreen and keep their color all year long in warmer zones, especially those in the EverColor® series. Rushes are naturally found in very wet or even boggy sites, making them well-suited for rain gardens or nearby water features. We love growing them in containers for a playful texture, especially if you choose Big Twister. Finally, true grasses (like Miscanthus, Festuca, and Calamagrostis) thrive in full sun and well-draining soils, producing spikes of flowers and seed heads in late summer.

We group all of them as “ornamental grasses” for one main reason: it’s a lot easier that way! They all add similar structure, texture, color, and movement, making them a must-have for your landscape.