Dwarf Hairgrass

Description

Eleocharis acicularis, commonly known as needle spikerush or dwarf hairgrass, is a popular carpeting plant in freshwater aquariums and aquascaping. With its thin, grass-like leaves and low-growing habit, it creates a soft, natural lawn effect across the substrate, making it a favorite for nature-style aquariums and Iwagumi layouts.

In aquariums, this plant is typically planted in small clumps directly into the substrate. Over time, it spreads through runners from its creeping rhizome, gradually forming a dense carpet. For best results, use a fine-grain, nutrient-rich substrate or supplement with root tabs to support healthy growth and spreading.

Lighting and CO₂ are critical for Eleocharis acicularis to thrive. It prefers moderate to high lighting and responds especially well to CO₂ injection, which encourages faster growth and fuller coverage. Without sufficient light or CO₂, the plant may grow slowly, become leggy, or fail to carpet effectively.

Though the flowers it produces in nature are rarely seen in aquariums, the plant’s primary appeal lies in its delicate, needle-like foliage and ability to create a vibrant green foreground. It can be trimmed regularly to maintain a short, uniform height, and clipping the tops can encourage horizontal spread.

Eleocharis acicularis is ideal for aquascapers aiming for a natural or minimalist aesthetic and provides micro-habitats for small fish, shrimp, and fry. Its versatility, aesthetic appeal, and low profile make it a staple in well-maintained planted tanks.