Plant comparison
Helanthium 'Vesuvius' vs Java Fern
How the Helanthium 'Vesuvius' and Java Fern compare on care, size, water and temperament, and which plant suits your tank.
By Mike ElmiraUpdated
TL;DR, Helanthium 'Vesuvius' vs Java Fern
The Helanthium 'Vesuvius' and the Java Fern 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 22 to 28 °C and pH 6 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 Helanthium 'Vesuvius' 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
- Helanthium 'Vesuvius'22–28 °C
- Java Fern20–28 °C
pH
- Helanthium 'Vesuvius'6–7.5
- Java Fern5.5–7.5
Hardness
- Helanthium 'Vesuvius'2–15 dGH
- Java Fern2–15 dGH
Full attributes
Every parameter, side by side| Parameter |  PlantHelanthium 'Vesuvius'Helanthium bolivianum 'Vesuvius' |  PlantJava FernMicrosorum pteropus |
|---|---|---|
| Category | Plant | Plant |
| Origin | Selectively bred cultivar (sport of H. bolivianum, South American parentage) | Southeast Asia |
| Family | Alismataceae | Polypodiaceae |
| Temperature | 22–28 °C | 20–28 °C |
| pH | 6.0–7.5 | 5.5–7.5 |
| Hardness (dGH) | 2–15 | 2–15 |
| Flow rate | Low to Medium | Low to High |
| Max height | 10–20 cm | 15–35 cm |
| Difficulty | 2 / 5 | 1 / 5 |
| Light | Medium to High | Low to Medium |
| CO₂ | Optional | None to Optional |
| Growth rate | Medium | Slow |
Frequently asked questions
Direct answers to the questions search engines and AI assistants surface most often about this species.
Can you keep Helanthium 'Vesuvius' and Java Fern together?
Yes. Their temperature and pH ranges overlap around 22 to 28 °C and pH 6 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 Helanthium 'Vesuvius' or the Java Fern?
The Java Fern is the easier of the two, closer to very easy, while the Helanthium 'Vesuvius' leans beginner-friendly.
Do Helanthium 'Vesuvius' and Java Fern need the same water?
Close to it. Aim for 22 to 28 °C and pH 6 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 Helanthium 'Vesuvius' and the Java Fern?
Placement and light. The Helanthium 'Vesuvius' works as midground, the Java Fern as midground or background, and their light needs differ, which is covered in the table.