Rush is a grass-like wetland perennial that has unjointed, smooth, upright, spire-like green stems (meaning the leaves are absent) which can grow in a spreading clump 20-40” tall and wide. Stems are usually solid, with the absence of leaves. Foliage turns yellow in the fall before browning up for winter. Tiny, yellowish-green to tan colored flowers bloom in single-sided clusters located on the side of the stem slightly below the tips. The flowers emerge in July through September.