Heteranthera Zosterifolia

Quick facts

Identity

Also known as

Stargrass; Star grass

Environment

Freshwater

Native to

Brazil, Argentina, Amazon basin, South America

Habitat

Slow-moving streams, flooded ditches, muddy swamps, and stagnant ponds in tropical South America, often seasonally transitioning between submerged and emersed growth.

Sourcing

Aquacultured

Conservation

Not Evaluated

Care

Care level

Easy

Growth form

Stem

Max height

4 – 16 in (10 – 41 cm)

Spread

6 in (15 cm)

Growth rate

Fast

Placement

Midground, Background

Water

Temperature

68 – 82 °F (20 – 28 °C)

pH

6.0 – 7.5

GH

3 – 15 dGH

PAR

40 – 80 PAR

Flow

Moderate

Light

Medium

CO₂

Beneficial

Planting

Substrate

Nutrient-rich preferred

Feeds from

Both

Fertilizer needs

High

Colors

Green

Feeding & breeding

Propagation

Cuttings

Something wrong or missing? Submit a correction

Care guide

Overview

Reaching up to 16 inches tall with fine stems spreading around 6 inches, Stargrass grows quickly under medium to strong light, sending up narrow leaves whorled into star-shaped clusters at each tip. It roots easily from cuttings and serves as a reliable nutrient indicator, paling when nitrate runs low. Regular trimming keeps stems dense rather than leggy and stretched.

Care

Stargrass is an upright stem plant with narrow leaves arranged in whorls that fan out into a star pattern at the growing tip. It adapts to a range of light levels but stays compact and full-colored only under medium to strong lighting, stretching and thinning out with visible gaps between nodes when kept too dim. CO2 injection is not strictly required but noticeably improves density and leaf size, and the stems benefit from regular pruning to prevent them from reaching the surface and shading out neighboring plants.

Planting & trimming

Plant stem cuttings a couple of centimeters apart directly into the substrate, burying the lower nodes where adventitious roots typically form. Trim the tops regularly once stems approach the surface, replanting the cut sections to thicken and fill out the group. It can also be grown emersed in paludariums, where it may produce small blue flowers rarely seen in fully submerged setups.

Fertilizing

This species feeds heavily from the water column and is considered a useful indicator plant for nutrient levels. Insufficient nitrate causes the leaves to turn pale or transparent before they die back, while a lack of phosphate dulls the bright green coloration to a darker shade. A steady dosing routine of liquid fertilizer, including iron and trace elements, keeps growth dense and the foliage a healthy color, while root tabs in the substrate provide supplemental support for the fine root system.

Propagation

Propagation is done through stem cuttings, trimming a healthy shoot, removing the lower leaves, and replanting it into the substrate where it roots quickly. Accidental breakages from handling can also be replanted successfully since the stems root readily from nodes. Regular trimming of the mother plants provides a continuous supply of cuttings for expanding the group.

Problems

Etiolation is the most common issue, showing up as elongated internodes, leggy stems, and dropped lower leaves when light is inadequate. Nutrient deficiencies quickly show as pale, transparent, or blackened foliage, particularly at the base of older stems. The brittle stems snap easily during handling or maintenance, though broken pieces root readily when replanted.

Sources

1. Star grass care: light, CO2 and placement · TankBud
2. Heteranthera zosterifolia – Fast-Growing Star Grass for Aquarium Background
3. Heteranthera zosterifolia - Stargrass - Flowgrow Aquatic Plant Database
4. Heteranthera zosterifolia Aquatic Plant Care | Atlarium

More Stem plants

Alternanthera Amabilis TricolorAlternanthera Bettzickiana GreenAlternanthera Bettzickiana RedAlternanthera LilacinaAlternanthera Red Broad LeafAlternanthera Reineckii