Microsorum pteropus "Thors Hammer"

Species description

Care, breeding and tankmates

Plant profile

Placement

Midground

Must be tied or glued to wood, rocks, or other decorative items in the aquarium. It looks best when positioned in the midground, where its unique leaf structure can be showcased. The rhizome should always be kept exposed to the water.

Botanical form

Rhizome

Highly distinctive for its deeply bifurcated, forked leaf tips that resemble the mythical hammer of Thor. The leaves are typically broad at the base and split heavily towards the ends, creating a complex, ragged appearance. It grows from a hardy rhizome and features a leathery, vibrant green texture.

Growth

Slow

Notoriously slow-growing, it requires significant patience to form a large clump. This slow pace makes it excellent for layouts where frequent trimming is undesirable. Consistent water parameters will help it maintain a steady, albeit slow, development.

Substrate

None

This unique cultivar, Microsorum pteropus "Thors Hammer", shares the strict epiphytic requirements of all Java Ferns. The rhizome serves as the critical center of growth and must be kept clear of sand, gravel, or soil. By fixing the plant to branches or hardscape features, its tough, hair-like roots will naturally adhere to the surface to provide immense stability against water currents.

Column fertilization

Recommended

Draws all necessary nutrients straight from the surrounding water column. A weekly dose of comprehensive liquid fertilizer is recommended to keep the foliage lush and green. Adequate water circulation helps deliver these nutrients effectively to the plant's surface.

Root fertilization

None

Does not benefit from root tabs or nutrient substrates since it is an epiphytic fern. Burying the roots or rhizome will almost certainly result in the plant rotting and dying. All nutritional support must come from the water column.

Trimming

Occasional

Trimming is rarely needed due to its incredibly slow growth rate. When necessary, simply clip off any dead, dying, or heavily algae-infested leaves at the base near the rhizome. This helps redirect the plant's energy into producing new, healthy, hammer-shaped fronds.

Propagation

Cuttings

Easily propagated by cutting the main rhizome into smaller sections with a sharp tool. Each section will continue to grow as an independent plant if it has a few leaves and roots. It also frequently spawns small plantlets from the tips and undersides of old leaves.

Sensitivity

Moderate

Extremely tough and resistant to herbivorous fish, thanks to its tough leaf structure. However, it is very sensitive to being planted in the substrate, which will cause it to rot. It thrives best in clean water with moderate flow to prevent algae from settling on its slow-growing leaves.

Layout role

Epiphyte, Midground, Background

Acts as a spectacular, eye-catching centerpiece or accent plant in the midground. Its heavily branched leaves create intricate shadows and hiding spots for small fish and shrimp. It adds a wild, ancient, and highly textured look to any nature aquarium layout.