Plant comparison
Java Fern vs Pearlweed
How the Java Fern and Pearlweed compare on care, size, water and temperament, and which plant suits your tank.
By Mike ElmiraUpdated
TL;DR, Java Fern vs Pearlweed
The Java Fern and the Pearlweed come up together a lot when people are choosing a plant, and they are close enough to weigh side by side. Both are happy somewhere around 20 to 28 °C and pH 5.5 to 7.5, so a single tank can suit either one. The Java Fern is the more forgiving of the two, which matters if this is an early tank, while the Pearlweed rewards a bit more attention. In a low-tech, low-light setup the Java Fern is the safer bet; the other really wants brighter light to look its best.
Group compatibility overview
Excellent fit
Every key parameter overlaps and no major conflicts surfaced.
Temperature
- Java Fern20–28 °C
- Pearlweed20–28 °C
pH
- Java Fern5.5–7.5
- Pearlweed5.5–7.5
Hardness
- Java Fern2–15 dGH
- Pearlweed2–15 dGH
Full attributes
Every parameter, side by side| Parameter |  PlantJava FernMicrosorum pteropus |  PlantPearlweedMicranthemum micranthemoides |
|---|---|---|
| Category | Plant | Plant |
| Origin | Southeast Asia | Eastern and southern USA, Cuba |
| Family | Polypodiaceae | Linderniaceae |
| Temperature | 20–28 °C | 20–28 °C |
| pH | 5.5–7.5 | 5.5–7.5 |
| Hardness (dGH) | 2–15 | 2–15 |
| Flow rate | Low to High | Low to Medium |
| Max height | 15–35 cm | 5–25 (varies hugely with light) cm |
| Difficulty | 1 / 5 | 2 / 5 |
| Light | Low to Medium | Medium to High |
| CO₂ | None to Optional | Optional |
| Growth rate | Slow | Fast |
Frequently asked questions
Direct answers to the questions search engines and AI assistants surface most often about this species.
Can you keep Java Fern and Pearlweed together?
Yes. Their temperature and pH ranges overlap around 20 to 28 °C and pH 5.5 to 7.5, so one set of water conditions keeps both comfortable. Match group sizes and cover the usual planted-tank basics and they share a tank fine.
Which is easier to keep, the Java Fern or the Pearlweed?
The Java Fern is the easier of the two, closer to very easy, while the Pearlweed leans beginner-friendly.
Do Java Fern and Pearlweed need the same water?
Close to it. Aim for 20 to 28 °C and pH 5.5 to 7.5 and you're in the shared sweet spot for both. Full ranges are in the table above.
What's the main difference between the Java Fern and the Pearlweed?
Placement and light. The Java Fern works as midground or background, the Pearlweed as foreground or midground, and their light needs differ, which is covered in the table.