Trident Java fern

Overview

Trident Java fern (Microsorum pteropus ‘Trident’) is a refined cultivar of the classic Java fern, with slim fronds divided into many narrow, finger-like lobes. The result is a finer, bushier, more delicate texture that many aquascapers prefer to the broad standard form, while keeping every bit of Java fern’s legendary hardiness. It needs no CO2, tolerates low light, is left alone by most fish, and asks only that its rhizome stays out of the substrate.

Planting & placement

Trident is a rhizome plant and an epiphyte. Tie or glue the rhizome to driftwood or rock, leaving the rhizome exposed in open water so only the roots grip the surface — see our how to plant aquarium plants walkthrough. Its finer, more compact fronds suit the midground to background, and it layers beautifully with Anubias and mosses on the same hardscape in a natural aquascape.

Light, CO2 & ferts

Keep light low to medium — like all Java ferns, Trident develops black crispy patches and algae under strong light. It needs no CO2, though a little makes it grow denser and a touch faster. As a leaf-feeder it responds best to a regular liquid water-column fertilizer rather than root tabs; a modest weekly dose keeps the fronds deep green.

Propagation & problems

Trident propagates itself for free. Mature fronds grow tiny plantlets along their edges and tips; once each has a few small leaves and roots, detach it and attach it elsewhere. You can also divide the rhizome into sections, each with roots and fronds. The familiar “problem,” small brown spots, is usually just reproduction or a buried rhizome rather than disease. Trident is also tolerant of a wide range of temperatures and hardness, and its tough fronds are ignored by most fish, making it a safe choice for goldfish and cichlid tanks. For faster, denser growth add light and try our CO2 systems options, but a simple low-tech setup grows Trident perfectly well and its finer texture makes even a single plant look full.