Umbrella Hair Grass (Eleocharis Vivipara)

Quick facts

Identity

Also known as

Viviparous spikerush; Tall hairgrass

Synonyms

Eleocharis baldwinii var. vivipara

Environment

Freshwater

Native to

United States (Virginia to Texas and Florida)

Habitat

Pond margins, marshes, swamps and wet ditches in the southeastern United States, rooting in shallow water and mud

Sourcing

Aquacultured

Conservation

Not Evaluated

Care

Care level

Easy

Growth form

Rosette

Max height

4 – 16 in (10 – 41 cm)

Growth rate

Moderate

Placement

Midground, Background

Water

Temperature

68 – 82 °F (20 – 28 °C)

pH

5.5 – 7.5

GH

2 – 12 dGH

PAR

30 – 60 PAR

Flow

Low-Moderate

Light

Medium

CO₂

Beneficial

Planting

Substrate

Nutrient-rich preferred

Feeds from

Roots

Fertilizer needs

Medium

Colors

Green

Feeding & breeding

Propagation

Runners, Plantlets

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Care guide

Overview

Fine, needle-like blades rise straight before arching over near the water surface, forming a canopy effect once they outgrow the tank's depth. Rooted from runners in a nutrient-rich substrate, it spreads gradually across the background and also produces small plantlets at the leaf tips that root where they touch down. Moderate light and steady root feeding keep growth compact rather than leggy; regular trimming and thinning maintain an open midground below.

Care

Umbrella hairgrass grows as a taller, arching relative of dwarf hairgrass, sending up fine leafless culms that eventually bend over near the water surface once they outgrow the tank depth. It tolerates a wide range of conditions and does not strictly require CO2, but medium to high light and supplemental carbon noticeably increase density and keep growth compact rather than leggy. Regular trimming is needed to prevent it from shading out lower plants and to keep the arching canopy tidy, and thinning out runners keeps the stand from becoming overcrowded.

Planting & trimming

Separate clumps into small portions and plant them roughly an inch apart, burying the roots about halfway into the substrate while keeping the base of the stems above the surface. Once established the plant spreads on its own via lateral runners, filling in gaps over several weeks, and older stands can simply be thinned by pulling out excess shoots rather than replanting. Daughter plantlets that form at the leaf tips can be snipped off and pressed into the substrate elsewhere to start new clumps.

Fertilizing

This plant draws most of its nutrition through its root system, so a nutrient-rich substrate or the regular use of root tabs supports the strongest growth, particularly in inert gravel setups. Liquid fertilizers supplying iron and nitrogen help maintain deep green coloration and prevent thin, pale leaves. In low-tech tanks without CO2, keeping a steady dosing routine matters more since growth is naturally slower and deficiencies show up more readily.

Propagation

The species propagates readily by underground runners that send up new shoots across the substrate, and can be divided simply by separating connected clumps. It also produces small viviparous plantlets directly on the tips of mature leaf blades, a distinctive trait for the species; these bend down, root where they touch the substrate, and grow into independent plants. Both runner divisions and detached plantlets can be replanted to start new colonies elsewhere in the tank.

Problems

New imports commonly melt back after the switch from emersed nursery growth to fully submersed conditions, with old leaves dying off before fresh growth appears from the base. This is a normal transition and not a sign of a dying plant, though patience over a few weeks is required. Because the leaves are fine and hair-like, algae can accumulate on them if light, CO2 and nutrients fall out of balance, so consistent dosing and adequate flow around the stand help keep it clean.

Sources

1. Umbrella hairgrass care: light, CO2 and placement · TankBud
2. Umbrella Hairgrass (Eleocharis vivipara) Care & Tank Mates, Fin & Stem
3. Eleocharis vivipara – Easy Background Grass for Aquariums
4. Eleocharis vivipara "Tall Hair Grass" - EpicAquatics