Hairgrass (Eleocharis acicularis), also known as needle spikerush or least spikerush, is a very popular mid-ground plant for the serious freshwater aquarium. This hardy, fast-growing plant can quickly “carpet” most aquariums. It is taller than Dwarf Hairgrass, but much shorter than Giant Hairgrass.
This variety of Hairgrass requires moderate to high lighting. It does not have to be pruned often unless more horizontal growth is desired. If used for carpeting the aquarium, it should be trimmed weekly to promote horizontal growth. It will grow very quickly in nutrient-rich substrate. It will also benefit from CO2 supplementation, but this is not required.
Like most plants, Hairgrass will benefit from supplementation such as Seachem Flourish, Flourish Excel, nitrogen, and other plant supplements.