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Here is all about Juncus repens "Green" — a hardy, grass-like freshwater aquarium plant appreciated for its slender green stems, slow growth, and versatility in both low- and high-tech tanks.


🌿 Scientific Classification

  • Scientific Name: Juncus repens

  • Common Name: Creeping Rush, Green Juncus

  • Family: Juncaceae (Rush family)

  • Origin: Southeastern United States (Florida, Georgia, Alabama, etc.)

✅ Unlike the red-tinted version, Juncus repens "Green" remains consistently green, even under high light and CO₂. It is ideal for natural-style aquascapes that focus on texture and subtle form over bright colors.


🌱 Appearance

  • Leaf Shape: Thin, cylindrical, needle-like stems

  • Color: Fresh light to medium green under all conditions

  • Height: 10 – 30 cm (4 – 12 inches)

  • Width/Spread: 3 – 6 cm (1 – 2.5 inches) per stem or clump

  • Growth Habit: Upright and sometimes gently arching; can creep horizontally with trimming

🎍 Looks like a fine aquatic grass, making it excellent for contrast with broader-leaved species.


💧 Ideal Tank Conditions

Parameter Optimal Range
Temperature 20–28°C (68–82°F)
pH 6.0–7.5
Hardness Soft to moderate (2–12 dGH)
Lighting Low to high (adaptable)
CO₂ Optional — grows fine in low-tech tanks
Substrate Nutrient-rich preferred; works in inert with root tabs

🌾 Growth & Propagation

  • Growth Rate: Slow to moderate

  • Propagation: Trim and replant side or top shoots

  • Maintenance: Occasional pruning encourages creeping and fuller growth

  • Spacing: Plant in small clumps spaced a few centimeters apart for soft, flowing coverage


🌟 Aquascaping Use

  • Best for midground, corner, or accent plantings

  • Adds grassy texture and vertical contrast

  • Pairs well with:

    • Anubias

    • Cryptocoryne

    • Bucephalandra

    • Monte Carlo or moss carpets

  • Ideal for Dutch, Nature, or Iwagumi-style layouts


🧠 Care Tips

  • Thrives in low-tech tanks with moderate light

  • Will not change color like the red form — remains lush green

  • Dose basic macro and micronutrients to support healthy growth

  • Avoid overcrowding to prevent loss of lower shoots

  • Benefits from gentle flow and open planting areas


⚠️ Common Issues

  • May melt slightly during initial planting (typical for emersed forms)

  • Can become leggy in very low light or heavily shaded areas

  • Growth may stagnate without adequate nutrients at roots


🐠 Compatibility

  • Very safe for all community tank inhabitants — fish, shrimp, snails, and fry

  • Not favored by herbivorous fish

  • Offers gentle hiding spots for shrimp and fry


📌 Summary

Feature Details
Color Light to medium green
Growth Habit Upright, grass-like, slightly creeping
Placement Midground or soft background
Lighting Low to high (adaptable)
CO₂ Optional
Difficulty Easy – beginner-friendly
Growth Rate Slow to moderate

Why Choose Juncus repens "Green"?

  • Ideal for low-maintenance planted tanks

  • Adds soft, grassy movement without aggressive growth

  • Perfect alternative to hairgrass in slow-growing tanks

  • Great for subtle contrast and naturalistic aquascapes



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