1. Scientific Classification

• Scientific name: Eleocharis montevidensis

• Family: Cyperaceae

• Common names:

  • Tall Hairgrass

  • Spike Rush

  • Montevideo Hairgrass

• Origin: North America, Central America, and South America

This species is a tall grass-like aquatic plant often used to create natural reed or meadow backgrounds in aquascapes.

🌱 Plant Characteristics

Unlike shorter hairgrass species, this one produces long flowing stems, giving a wild marsh-like appearance.

💡 Ideal Aquarium Conditions

It tolerates low-tech aquariums, though CO₂ speeds up growth.

💧 Nutrient Requirements

Main nutrient source:

• Substrate (root feeder)

Recommended:

• Nutrient-rich aquasoil

• Root tabs in sand or gravel tanks

Key nutrients:

• Nitrogen (N)

• Iron (Fe)

• Potassium (K)

🌿 Growth Pattern

Growth occurs via underground runners.

Growth cycle:

1. Parent plant establishes roots.

2. Runners spread horizontally.

3. New shoots emerge forming dense grass patches.

Over time it can create large natural grass clusters.

✂️ Planting Method (Tissue Culture / Pots)

1. Divide the plant into small clumps.

2. Plant 3–5 cm apart using aquascaping tweezers.

3. Roots should be buried but do not bury the crown too deep.

4. Runners will spread and fill the area.

⚠️ Common Problems

1. Leaves turning yellow

• Nutrient deficiency (often iron).

2. Weak or thin stems

• Lighting too low.

3. Slow spreading

• Poor substrate nutrition.

🐠 Aquascaping Uses

Best placement:

• Background plant

• Side areas of aquascape

• Natural riverbank style aquascapes

Often combined with:

• Cyperus helferi

• Vallisneria spiralis

• Eleocharis acicularis

It adds height and movement, especially with water flow.

🌸 Interesting Feature

In emersed conditions, the plant may produce small brownish spike flowers typical of sedge plants.

📊 Difficulty Level

Easy → Medium

Good for:

• Beginner planted tanks

• Nature-style aquascapes

• Large aquariums needing tall grass

✅ Quick Summary