Care at a glance
Best beginner carpet plant. Trim short after planting to encourage horizontal runners. CO₂ dramatically speeds carpet formation.
By Mike ElmiraUpdated 1 min read
Part of our complete guide to the planted aquarium.
PlantCarpet
Dwarf Hairgrass
Eleocharis parvula
Worldwide temperate / subtropicalEasy
TL;DR, Dwarf Hairgrass
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.
- LightLow to High
- CO₂Optional to Recommended
Hero photo by Robert H. Mohlenbrock · Public domain · Wikipedia
Tank fit
The parameters that decide whether dwarf hairgrass fits in your tank.
Parameters
15 °C20 °C25 °C30 °C
4.05.06.07.08.0
0 dGH5 dGH10 dGH15 dGH20 dGH25 dGH
020406080
Low
Medium
High
None
Optional
Recommended
Required
Slow
Medium
Fast
V. fast
Still
Low
Medium
High
V. high
Profile
Family
Cyperaceae
Type
Carpet / Runner
Position
Foreground
Substrate
Fine, nutrient-rich substrate + root tabs
Propagation
Runners
Habitat
Damp shorelines of temperate ponds and seasonal ditches
Worldwide temperate / subtropical
Who it lives with
Tank-mate safety and the species this one is documented to thrive (or fail) alongside.
Pro tips
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.
Things to watch for
What can go wrong and how to spot it.
Things to watch for
Failure modes, in order of how dramatic the fix is.
Nutrition
Common deficiencies
Brown tips: insufficient CO₂ or iron. Slow spread: insufficient light or root nutrition. Pale: nitrogen.
Algae
Algae issues
Hair algae and BBA love to attach to the fine leaves. Stable CO₂ and limited light hours during carpet formation prevent this.
How to care for it
The practical routine, read top to bottom.
Fertilization
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.
Trimming
Trim short (to 2 cm) after planting to redirect energy to horizontal runners. Once established, mow every 4–6 weeks to keep dense.
Background
Where it comes from, how it behaves, and the variants you'll see at retail.
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In the wild
Where it lived before it came home.
Origin · Worldwide temperate / subtropical
Cool, wet meadows and pond edges across temperate and subtropical zones globally.
Emersed form
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.
Flowering
Tiny inconspicuous emersed flowers; never flowers submerged.
Variants & identification
The named cultivars and the lookalikes worth flagging.
Variants / cultivars
E. parvula (true dwarf, ~5 cm), E. acicularis (taller, ~10 cm), E. 'Mini' (tiny). True parvula is the smallest and best for carpets.
Misidentification
Often mislabelled — E. acicularis is sold as 'dwarf hairgrass' but grows much taller. True parvula has tighter, shorter blades.
Frequently asked questions
Direct answers to the questions search engines and AI assistants surface most often about this species.
Does Dwarf Hairgrass need CO₂?
CO₂ requirement: optional to recommended. Light requirement: low to high. Under low-tech conditions the plant grows at a medium rate.
What light level does Dwarf Hairgrass need?
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.
Where should Dwarf Hairgrass be planted?
Position: foreground. Substrate: Fine, nutrient-rich substrate + root tabs It typically reaches 5–10 cm.
How do you propagate Dwarf Hairgrass?
Propagation method: Runners. Dwarf Hairgrass is a carpet / runner plant.
What water parameters does Dwarf Hairgrass tolerate?
Target 20–28 °C, pH 6.0–7.5, and 2–10 dGH. Flow tolerance: low to medium.
Is Dwarf Hairgrass suitable for beginners?
Difficulty: 2/5. Forgiving, beginner-friendly once the tank is cycled.
Sources & further reading
More plants
See all plantsAdjacent specimens in the catalogue.
Cross-references
Build the rest of the tank.
A planted tank is a system. Pair this plant with one entry from each other pillar to plan the whole scape.
