Plant Profile Ready to drop the hammer on boring aquascapes? Hailing from Poland, Java Fern 'Thor's Hammer' is a rare cultivar that brings the thunder to your midground zones. Featuring sleeker, narrower leaves than standard Java Fern, its fronds branch out at the tips into distinct, hammer-shaped crests, offering a bolder, blockier take on the finely branched tips seen on Java Fern Windelov. This bulletproof epiphyte thrives under dim lighting, laughs in the face of parameter swings, and remains delightfully unbothered by curious fish looking for a snack. Key Features & Notes Tough, fibrous foliage easily withstands curious nipping from herbivorous fish like cichlids, goldfish, and large snails. Unique crested leaf tips and slender fronds add texture and detail. Exceptional hardiness lets it thrive in non-CO2 tanks and low-light environments. Care & Planting Instructions Prep the plant by removing it from the pot and clearing all rockwool from the roots. Java Fern 'Thor's Hammer' is an epiphytic fern that should be attached to rocks or driftwood with aquarium-safe glue or thread; never bury the horizontal rhizome in substrate, as it will rot and melt. Avoid making drastic changes to your water parameters or lighting because unstable conditions are the primary cause of leaf melt in new specimens. While this plant is hardy and low-maintenance in standard setups, gentle water movement and regular liquid fertilizing will yield much faster growth and broader fronds. Master long-term care and troubleshoot common leaf issues by checking out our Java Fern Care Guide. Final size and foliage pattern depend entirely on your specific aquarium conditions; please note that photos are a representation, and individual plants may vary. Quick Facts Listed information should be treated as general guidelines only. Team Buce Plant encourages you to do thorough research to ensure healthy growth! Attribute Specification Scientific Name Microsorum pteropus 'Thor's Hammer' (syn. Leptochilus pteropus) Common Name(s) Java Fern Thor's Hammer, Thor Java Fern Family Polypodiaceae Plant Type Epiphyte (Rhizome Fern) Care Difficulty Beginner / Easy (Low-Tech Compatible) Light Requirement Low to Medium CO2 Requirement Not Required (Beneficial) Placement / Usage Foreground, Midground, Focal Hardscape Accent Height / Size 5"–8" (13–20 cm) Growth Rate Slow to Moderate Water Parameters pH 6.0–7.5 | Temperature 68°F–82°F (20°C–28°C) Propagation Method Rhizome Division & Adventitious Plantlets Origin Poland (Cultivated Variety) / Native to Asia Frequently Asked Questions 1. What makes Java Fern 'Thor's Hammer' different from regular Java Fern? Unlike standard Java Fern which features smooth, undivided leaf blades, 'Thor's Hammer' boasts narrower fronds that split and crest into distinct, hammer-shaped tips at the ends. It is an extremely rare variant originating from selective cultivation in Poland. 2. Why are there small black spots and tiny leaves growing under my Java Fern 'Thor's Hammer' leaves? Do not panic; your plant hasn't been smitten by lightning! Java Fern reproduces naturally through adventitious plantlets. Small dark bumps (sporangia) form along the undersides of mature leaves, sprouting tiny brown roots and mini green fronds. Once these baby plantlets develop 3–4 leaves, you can gently pop them off the mother leaf and glue them elsewhere in your aquarium. 3. Can I plant Java Fern 'Thor's Hammer' into substrate? No. Java Fern 'Thor's Hammer' is an epiphyte that absorbs nutrients directly from the water column through its foliage and fine root network. If you bury its horizontal rhizome beneath aquarium soil, sand, or gravel, the stem will suffocate, rot, and die. Always attach it to rocks or driftwood using aquarium-safe glue or thread. 4. Will fish like cichlids or goldfish eat Java Fern 'Thor's Hammer'? Generally, no. Java Fern leaves are thick, fibrous, and contain bitter-tasting compounds that deter most plant-eating fish. While aggressive diggers might knock it off hardscape if not glued securely, they rarely consume the foliage.
