Can you cut down ornamental grasses in the fall?

Yes, you can cut down ornamental grasses in the fall, but it's generally recommended to wait until late winter or early spring for the best results. Cutting them back in the fall can expose the plants to winter damage and reduce their winter interest. However, if the grasses are messy or you prefer a tidier look for winter, you can trim them back to about 4-6 inches above the ground. Just be sure to clean up any debris to prevent pests and diseases.