Giant reed, scientifically known as Arundo donax, is a tall perennial grass that can grow up to 20 feet in height. It is native to regions of the Mediterranean and Asia but has spread to many parts of the world, often thriving in wetlands and along riverbanks. The plant features long, slender stems and feathery flower clusters that can be seen in late summer. This grass is known for its rapid growth and ability to tolerate various soil conditions. While it can be used for erosion control and as a natural privacy screen, giant reed can also become invasive, outcompeting native plants in some ecosystems.