Tropica Microsorum pteropus – Potted
Microsorum pteropus, commonly known as Java Fern, is a water fern native to Asia. It grows to a height of 15–30 cm and thrives when attached to a root or stone using fishing line until it establishes a firm hold. When planted in the substrate, the rhizome should not be covered, as this can lead to rot. The plant is easy to propagate by splitting the horizontal rhizome. It is a hardy species that adapts well to various water conditions. Small black spots under the leaves are sporangia, the plant’s reproductive structures, not signs of disease.
Planting Instructions
| Step | Instruction |
|---|---|
| 1 | Attach the fern to a root or stone using fishing line. |
| 2 | Allow it to anchor for several weeks before adjusting position. |
| 3 | Do not cover the rhizome when planted in substrate. |
FAQ
Can I plant Java Fern directly in the substrate without attaching it?
It is not recommended to plant Java Fern directly in substrate without attaching it. The rhizome should not be covered, as this can cause rot. Best practice is to attach it to a root or stone using fishing line until it establishes a hold.
What do the black spots under the leaves mean?
The black spots under the leaves are sporangia, which are natural reproductive organs of the plant. They are not a sign of disease or damage.
How do I propagate this plant?
Java Fern can be easily propagated by splitting the horizontal rhizome. Carefully separate the sections and replant them in a suitable environment.

Connor Watson –
Grew my Java Fern in a freshwater tank and it has been thriving for over six months. The plant stays healthy even in low-light conditions. I attached it to a rock with fishing line and it has firmly rooted. The black spots under the leaves are normal and not a concern.
Robert Allan –
Easy to set up and maintains a clean, natural look in my aquarium. I didn’t cover the rhizome as instructed and it hasn’t shown any signs of rot. The plant grows slowly but steadily.
Thomas Bond –
Perfect for beginners. I split the rhizome and planted two sections. Both have grown well in a few weeks. The plant is hardy and doesn’t need much maintenance.