Eleocharis parvula
Best beginner carpet plant. Trim short after planting to encourage horizontal runners. CO₂ dramatically speeds carpet formation.
Dwarf Hairgrass (Eleocharis parvula) is a carpet / runner aquatic plant for the foreground of a planted tank. It reaches 5–10 cm under good conditions and grows at a medium rate. Light: low to high. CO₂: optional to recommended. Target 20–28 °C, pH 6.0–7.5, and 2–10 dGH. Substrate: Fine, nutrient-rich substrate + root tabs. Propagate via runners.
Care at a glance
Best beginner carpet plant. Trim short after planting to encourage horizontal runners. CO₂ dramatically speeds carpet formation.
Updated 1 min read
Part of our complete guide to the planted aquarium.
Leaves yellowing, pitting, or new growth coming in pale or twisted? Work out what it’s short of in our plant deficiency guide.
Hero photo by Robert H. Mohlenbrock · Public domain · Wikipedia
The parameters that decide whether dwarf hairgrass fits in your tank.
Cyperaceae
Carpet / Runner
Foreground
Fine, nutrient-rich substrate + root tabs
Runners
Damp shorelines of temperate ponds and seasonal ditches
Worldwide temperate / subtropical
Tank-mate safety and the species this one is documented to thrive (or fail) alongside.
Weighing it against something similar? Compare Dwarf Hairgrass head to head:
Hard-won lessons from the tank.
Split tissue-culture clumps into 2x2 cm portions and plant in a grid 3 cm apart. Use long tweezers, push each portion fully into substrate so only blades show. Carpet completes in 6–8 weeks with CO₂, 12+ weeks without. Resist the urge to plant fewer larger clumps — small grids carpet faster.
What can go wrong and how to spot it.
Failure modes, in order of how dramatic the fix is.
Brown tips: insufficient CO₂ or iron. Slow spread: insufficient light or root nutrition. Pale: nitrogen.
Hair algae and BBA love to attach to the fine leaves. Stable CO₂ and limited light hours during carpet formation prevent this.
The practical routine, read top to bottom.
Moderate root and column feeder. Root tabs in the substrate every 4 months. Column macro (N, P, K) for spread. CO₂ dramatically speeds carpet formation.
Trim short (to 2 cm) after planting to redirect energy to horizontal runners. Once established, mow every 4–6 weeks to keep dense.
Where it comes from, how it behaves, and the variants you'll see at retail.
Where it lived before it came home.
Cool, wet meadows and pond edges across temperate and subtropical zones globally.
Grows in tight green clumps when emersed; sold this way in tissue culture and pots, then transitions to submerged form (longer, finer leaves) in the tank.
Tiny inconspicuous emersed flowers; never flowers submerged.
The named cultivars and the lookalikes worth flagging.
E. parvula (true dwarf, ~5 cm), E. acicularis (taller, ~10 cm), E. 'Mini' (tiny). True parvula is the smallest and best for carpets.
Often mislabelled — E. acicularis is sold as 'dwarf hairgrass' but grows much taller. True parvula has tighter, shorter blades.
Direct answers to the questions search engines and AI assistants surface most often about this species.
CO₂ requirement: optional to recommended. Light requirement: low to high. Under low-tech conditions the plant grows at a medium rate.
Dwarf Hairgrass (Eleocharis parvula) needs low to high light. Run a photoperiod of 6–8 hours; longer photoperiods invite algae unless CO₂ and dosing are dialled in.
Position: foreground. Substrate: Fine, nutrient-rich substrate + root tabs It typically reaches 5–10 cm.
Propagation method: Runners. Dwarf Hairgrass is a carpet / runner plant.
Target 20–28 °C, pH 6.0–7.5, and 2–10 dGH. Flow tolerance: low to medium.
Difficulty: 2/5. Forgiving, beginner-friendly once the tank is cycled.
A planted tank is a system. Pair this plant with one entry from each other pillar to plan the whole scape.
