Plant comparison
Amazon Sword vs Ammannia Gracilis
How the Amazon Sword and Ammannia Gracilis compare on care, size, water and temperament, and which plant suits your tank.
By Mike ElmiraUpdated
TL;DR, Amazon Sword vs Ammannia Gracilis
The Amazon Sword and the Ammannia Gracilis 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 6.5 to 7.5, so a single tank can suit either one. The Amazon Sword is the more forgiving of the two, which matters if this is an early tank, while the Ammannia Gracilis rewards a bit more attention. In a low-tech, low-light setup the Amazon Sword 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
- Amazon Sword22–28 °C
- Ammannia Gracilis22–28 °C
pH
- Amazon Sword6.5–7.5
- Ammannia Gracilis5.5–7.5
Hardness
- Amazon Sword3–18 dGH
- Ammannia Gracilis2–15 dGH
Full attributes
Every parameter, side by side| Parameter |  PlantAmazon SwordEchinodorus grisebachii |  PlantAmmannia GracilisAmmannia gracilis |
|---|---|---|
| Category | Plant | Plant |
| Origin | Brazil | West Africa, Senegal to Cameroon |
| Family | Alismataceae | Lythraceae |
| Temperature | 22–28 °C | 22–28 °C |
| pH | 6.5–7.5 | 5.5–7.5 |
| Hardness (dGH) | 3–18 | 2–15 |
| Flow rate | Low to Medium | Low to Medium |
| Max height | 40–50 cm | 30–60 cm |
| Difficulty | 2 / 5 | 3 / 5 |
| Light | Low to Medium | High |
| CO₂ | Optional | Required |
| Growth rate | Medium to Fast | Medium |
Frequently asked questions
Direct answers to the questions search engines and AI assistants surface most often about this species.
Can you keep Amazon Sword and Ammannia Gracilis together?
Yes. Their temperature and pH ranges overlap around 22 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 Amazon Sword or the Ammannia Gracilis?
The Amazon Sword is the easier of the two, closer to beginner-friendly, while the Ammannia Gracilis leans middle-of-the-road.
Do Amazon Sword and Ammannia Gracilis need the same water?
Close to it. Aim for 22 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 Amazon Sword and the Ammannia Gracilis?
Placement and light. The Amazon Sword works as background, the Ammannia Gracilis as background, and their light needs differ, which is covered in the table.