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Eriocaulon setaceum

Eriocaulon setaceum

Eriocaulon setaceum: a beautiful and highly challenging stem plant for the midground. Its very fine needles form a spectacular feathery crown.

Taxonomy
Class:Liliopsida
Order:Poales
Family:Eriocaulaceae
Genus:Eriocaulon
Species:Eriocaulon setaceum

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Water Temperature

20 - 30 °C

pH Value

4.5 - 7

Water type

Freshwater

Light

High

CO2

High

GH

0 - 10 dGH

KH

0 - 7 dKH

Species description

Widespread in the tropical regions of Asia and Australia. It grows primarily in stagnant and clear waters of oligotrophic marshes and ponds under high light, often on very acidic peaty substrates. It belongs to the Eriocaulaceae family, genus Eriocaulon. It is one of the few species in this genus to develop a climbing or erect stem habit rather than a classic basal rosette. Erect stem densely covered by very fine needle-like leaves radiating 360 degrees.

Care, breeding and tankmates

Requires extremely soft (KH 0-2) and highly acidic water (pH 4.5-6.5). Sensitive to any accumulation of carbonate hardness. Optimal temperature between 20 and 30 °C. It is considered one of the most difficult plants in the aquarium hobby. Any deviation from the described chemical parameters can lead to immediate decay and melting of the stems.

Geographic Origin and Distribution

This species originates from: Asia, Australia.

Origin

South and Southeast AsiaAustralia, New Guinea, and Oceania

Plant profile

Placement
Midground

It is best planted in the background or midground in small, tight clusters. It needs unobstructed light, so ensure taller plants do not shade it. Its striking top profile makes it ideal for areas visible from above.

Botanical form
Stem

It is a stem plant with extremely fine, needle-like leaves radiating around the stem. When viewed from above, the shoot tips resemble delicate, green stars. The overall texture is incredibly soft and feathery.

Growth
Medium

Under optimal high-tech conditions, it exhibits a moderate to fast growth rate. It will steadily reach for the surface, necessitating regular maintenance. In suboptimal conditions, its growth will stall completely.

Substrate
High

Eriocaulon setaceum is a delicate and demanding species that relies heavily on a nutrient-dense substrate for optimal health. It develops an intricate and deeply penetrating root system, making a thick layer of high-quality, acidic aqua soil absolutely essential. The substrate depth should be at least 5-8 cm to allow the roots to anchor securely and absorb vital nutrients effectively. Because this plant absorbs a significant portion of its sustenance through its roots, a porous and fertile soil environment is critical to support its stunning, needle-like foliage.

Column fertilization
Recommended

It is a heavy water column feeder that demands strict adherence to comprehensive liquid fertilization. High CO2 levels and soft water are absolute requirements for survival. Trace element dosing enhances its pale green hue.

Root fertilization
None

While it absorbs primarily via its finely divided leaves, root tabs in a nutrient-rich substrate help support the plant. A good aquasoil provides a buffer and steady nutrient supply to its delicate roots.

Trimming
Occasional

Trim carefully by topping the stems and replanting the upper portions. The lower rooted portion often struggles to sprout new side shoots and is usually discarded. Regular topping keeps the stand looking fresh and bushy.

Propagation
Cuttings

Propagation is typically done by topping the plant and replanting the upper shoot. Occasionally, under very strong light, it may form side shoots naturally. These side shoots can be snipped and planted.

Sensitivity
Moderate

This is an extremely demanding species that melts rapidly in hard water or low light. It is unforgiving of CO2 or nutrient fluctuations. It does not tolerate being shaded by other plants or heavy algae growth.

Layout role
Midground, Background

It provides an elegant textural contrast in the midground to background. Its unique star-shaped tops create a stunning focal area. It is typically used as a delicate accent rather than a dense bush.

Image gallery

Licensed images linked to the species or, when marked, to the closest representative taxon.

Related species

Recommendations grouped by close relatives, companion choices, and similar care.

Variants and close relatives

Same atlas type, nearby scientific identity, genus, or family.

Eriocaulon cinereum

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Eriocaulon sp. "Goiás"

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Eriocaulon sp. Mato Grosso

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Eriocaulon sp. "Japan Needle Leaf"

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Syngonanthus cf. inundatus

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Last updated: 06/16/2026