Propagating Narrow Leaf Java Fern

How to multiply Narrow Leaf Java Fern through rhizome division and the daughter plantlets that form on its leaf tips, then attach the new ferns to hardscape.

Overview

Microsorum pteropus 'Narrow' is a slender cultivar of Java fern, an epiphyte that attaches to surfaces rather than rooting in substrate. Like the standard form it is extremely undemanding and tolerant of varied conditions, which makes it one of the easiest aquarium plants to multiply at home.

Propagation Method

There are two reliable routes. The first is rhizome division: the horizontal rhizome is simply cut into pieces, each carrying leaves and roots. The second is the plant's natural asexual habit of producing small adventitious plantlets from the leaf tips and margins of mature foliage; these tiny sprouts quickly develop roots of their own and, where water currents allow, attach themselves to surrounding objects.

Step-by-Step

Choose a mature plant with several healthy leaves and a firm rhizome.
For division, cut the rhizome into sections, leaving at least a few leaves and roots on each piece.
For plantlets, wait until the daughter ferns on the leaf tips have formed their own small roots, then gently detach them.
Tie or glue each new plant by its roots or rhizome to rock or driftwood.
Place the attached plant in the tank and leave it undisturbed while it anchors.

Conditions for Healthy Growth

Java fern thrives in low light and is happy in tap water, dim or bright light, with or without gravel. The narrow cultivar grows slowly, so patience helps new plants establish before they put on size.

Maintenance

Once attached, the fern needs little care. It is more snail resistant and grows better with higher fish loads, so a stocked, established tank suits it well. Leave divisions in place; do not pull on them while roots are gripping.

Common Challenges

The most common mistake is planting the rhizome into the substrate, which causes rot. Slow growth can also tempt aquarists to disturb new pieces too soon. Let plantlets root fully before detaching them, and give divisions weeks rather than days to take hold.