Plant comparison
Java Fern vs Giant Sagittaria
How the Java Fern and Giant Sagittaria compare on care, size, water and temperament, and which plant suits your tank.
By Mike ElmiraUpdated
TL;DR, Java Fern vs Giant Sagittaria
The Java Fern and the Giant Sagittaria 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 6.5 to 7.5, so a single tank can suit either one. Neither is harder than the other to keep, so the choice comes down to look and stocking rather than skill. 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
- Giant Sagittaria18–28 °C
pH
- Java Fern5.5–7.5
- Giant Sagittaria6.5–8
Hardness
- Java Fern2–15 dGH
- Giant Sagittaria5–20 dGH
Full attributes
Every parameter, side by side| Parameter |  PlantJava FernMicrosorum pteropus |  PlantGiant SagittariaSagittaria platyphylla |
|---|---|---|
| Category | Plant | Plant |
| Origin | Southeast Asia | Southeastern United States |
| Family | Polypodiaceae | Alismataceae |
| Temperature | 20–28 °C | 18–28 °C |
| pH | 5.5–7.5 | 6.5–8.0 |
| Hardness (dGH) | 2–15 | 5–20 |
| Flow rate | Low to High | Medium |
| Max height | 15–35 cm | 20–50 cm |
| Difficulty | 1 / 5 | 1 / 5 |
| Light | Low to Medium | Medium to High |
| CO₂ | None to Optional | Not required |
| Growth rate | Slow | Medium |
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 Giant Sagittaria together?
Yes. Their temperature and pH ranges overlap around 20 to 28 °C and pH 6.5 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 Giant Sagittaria?
They sit at the same care level, both very easy, so neither is the obvious beginner pick. The decision is really about the look you're after.
Do Java Fern and Giant Sagittaria need the same water?
Close to it. Aim for 20 to 28 °C and pH 6.5 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 Giant Sagittaria?
Placement and light. The Java Fern works as midground or background, the Giant Sagittaria as background or midground, and their light needs differ, which is covered in the table.