What native plant can reach heights of 3-10 ft with spongy, rounded stems and feathery bristles around the nutlet?

The southern (giant) bulrush is a native plant that can indeed grow between 3 to 10 feet tall, which is a significant height characteristic that distinguishes it from some of the other options. Its spongy, rounded stems provide buoyancy and support for its growth in aquatic environments. This plant also features feathery bristles around the nutlet, an important identifying characteristic of the southern bulrush. These bristles can help in the dispersal of seeds, allowing the plant to propagate effectively in wetland areas.

In understanding aquatic vegetation and its role in ecosystems, the features of the southern bulrush indicate its ability to thrive in diverse water levels and conditions. Its physical attributes not only assist in its growth but also contribute to habitats for various aquatic organisms, making it a significant component of wetland ecosystems.