Dwarf Hairgrass (Eleocharis acicularis) is one of the most widely recognised foreground carpeting plants in the aquarium hobby, producing a dense mat of fine, bright green needle-like blades that spread laterally across the substrate by horizontal runners. The individual blades are narrow and upright, typically reaching 3 to 7cm in height depending on light and CO2 conditions, and the fully developed carpet has a lawn-like uniformity that reads as clean and deliberate from any viewing angle. Dwarf Hairgrass spreads outward progressively from the initial planting points, filling gaps between clusters over four to ten weeks under good conditions and eventually covering the foreground substrate completely. CO2 significantly accelerates carpet development and produces shorter, denser growth; without CO2 the plant is viable but grows more slowly and the blades tend to grow taller and less dense. Medium to high light is required. Shrimp forage actively through the carpet, grazing the blade surfaces and the substrate layer beneath. Safe with all Neocaridina and Caridina shrimp.
RecommendedCO2
65–82°FTemperature
Med–HighLighting
Growth & Appearance
Carpet Development
Fine needle-like blades in bright green, spreading by horizontal runners to form a dense carpet. Each individual blade of Dwarf Hairgrass is very narrow and upright, giving the carpet a fine, grass-like texture at close range and a smooth, low-profile appearance at tank-viewing distance. Runners extend laterally from the base of established clumps, sending up new blade clusters at regular intervals. Over successive weeks these new clusters fill the spaces between the original planting points until the substrate is fully covered.
Blade height is controlled by light intensity and CO2 availability. Under high light with CO2 the blades remain short and compact, producing the dense, low-profile lawn appearance the plant is associated with in planted tank photography. Under medium light without CO2 the blades grow taller and the carpet is less dense, producing a more meadow-like appearance that is still attractive but different in character. Consistent trimming to a uniform height encourages lateral runner production and increases carpet density over time.
CO2 is the single most impactful variable for carpet development speed. Without CO2 the carpet develops but slowly, with runner production taking significantly longer to fill the foreground. With CO2 supplementation runner production accelerates considerably and the carpet reaches full coverage in a fraction of the time. For aquarists without a CO2 system, planting at a higher density (clusters every 1 to 2cm rather than every 3 to 4cm) partially compensates for the slower growth rate.
Root tabs at regular intervals support vigorous growth from the substrate up. Dwarf Hairgrass is a root feeder and responds well to nutrient availability in the substrate. Place root tabs at 8 to 10cm intervals across the planting area before establishing the carpet. In an established planted substrate with regular dosing the plant performs well without additional root tab supplementation.
How to Set It Up
Planting & Maintenance
1Divide the supplied portion into small clusters of 5 to 10 blades each. Separate the plant into individual small tufts using your fingers or scissors. Smaller clusters planted more densely produce faster and more even carpet coverage than larger clumps planted further apart.
2Plant clusters at 1 to 3cm spacing using aquarium tweezers, roots only into substrate, crown at surface. Push only the root mass and the very base of each cluster into the substrate. The crown where the blades emerge must remain at or just above the substrate surface. Burying the crown causes the cluster to rot rather than establish. In fine sand or aquasoil the plant anchors quickly; in coarser substrates use plant weights or gel super glue to hold clusters in position until roots develop.
3Place root tabs before planting if using an inert substrate. In sand, gravel, or any substrate without built-in nutrients, place root tabs at 8 to 10cm intervals across the planting area before inserting the first cluster. This ensures nutrient availability from the first week of establishment.
4Trim to a uniform height once the carpet establishes to encourage density. When the carpet has developed to a height you are satisfied with, trim across the full surface with sharp scissors to a uniform level. Trimming stimulates lateral runner production and encourages the carpet to thicken and fill any remaining gaps. Repeat every three to four weeks to maintain the desired height and density.
Aquascape TipDwarf Hairgrass as a foreground carpet under a midground of Bucephalandra or Anubias on driftwood, with a background of Rotala or Foxtail, is one of the most complete and visually satisfying three-layer planted tank compositions available. The fine texture of the hairgrass foreground reads as clearly different from the broader leaves of the midground and the feathery stems of the background, and shrimp foraging through all three layers simultaneously give the tank a sense of depth and life that single-layer planted setups cannot produce.
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