Needle spike rush is a unique plant that grows in marshy areas. Its scientific name is Eleocharis acicularis, but it is also commonly known as hairgrass or spike rush. Despite the specificity of its name, there are several synonyms for this plant, including needle rush, slender spike rush, and dwarf hairgrass. These terms describe the thin and needle-like appearance of its leaves and stems. They also highlight its diminutive size, which ranges from only a few inches to a foot in height. Needle spike rush is a popular choice for aquariums, ponds, and water gardens due to its hardiness and attractive appearance.