Sea rush stems are needle-sharp. The leaves also end in a sharp point. The flower appears on the side of the smooth stem, close to the top. Sometimes, the underground rootstocks are short so that thick clumps form. Other times, the rootstocks are longer and the plants are further apart. The yellow leaves surrounding the lower part of the stem give the plant a yellowish glow. Grazing cattle prefer other vegetation to the pricking tips of the sea rush, which makes it even easier for the plant to dominate. However, sea rush grows in very specific circumstances, which limits just how far it can spread.