Propagating Juncus repens: Division & Side Shoots

How to propagate Juncus repens (Creeping Rush), a grass-like aquarium plant, by dividing clumps and replanting side shoots, plus light tips that bring out its reddish-brown colour.

Overview

Juncus repens is a grass-like plant from swampy south-east North America that stays submerged and continues to grow underwater. It shows a pleasant green under moderate light and develops an attractive reddish-brown hue under strong light with micronutrients. Rather undemanding, it grows at a moderate but constant rate to about 10-20 cm, making a distinctive midground accent.

Propagation Method

It can be propagated by cuttings like stem plants. Because it grows as a grass-like, tufted clump, the most reliable approach is to divide an established clump and separate the side shoots, replanting each rooted section to start new tufts.

Step-by-Step

1. Lift a healthy, established clump and gently shake off loose substrate.
2. Tease the clump apart into smaller sections, each with its own roots and a few grass-like shoots.
3. Alternatively, snip individual side shoots as cuttings where the clump is dense.
4. Replant each division or shoot into nutrient-rich substrate, roots well buried.
5. Space sections a few centimetres apart so they spread and fill in.

Conditions for Healthy Growth

Light demand is medium and CO2 demand is medium (around 6-14 mg/L); brighter light plus micronutrients deepen the reddish-brown colouring, while moderate light keeps it green. Use a nutrient-rich substrate and temperatures of roughly 18-26C. Growth is slow to moderate but steady.

Trimming & Maintenance

Being a slow, undemanding plant, it needs only occasional grooming, roughly monthly. Trim overlong or shaded grass blades and divide congested clumps during maintenance to keep the tuft tidy and to harvest new plants.

Common Challenges

Patience is key, as it is slower than typical stem plants and reddens only under strong light. In dim tanks it stays plain green and may grow leggy; divisions can be slow to settle, so keep roots intact and avoid disturbing fresh transplants.