Plant comparison
Amazon Sword vs Pogostemon Helferi (Downoi)
How the Amazon Sword and Pogostemon Helferi (Downoi) compare on care, size, water and temperament, and which plant suits your tank.
By Mike ElmiraUpdated
TL;DR, Amazon Sword vs Pogostemon Helferi (Downoi)
The Amazon Sword and the Pogostemon Helferi (Downoi) 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 Pogostemon Helferi (Downoi) 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
- Pogostemon Helferi (Downoi)22–28 °C
pH
- Amazon Sword6.5–7.5
- Pogostemon Helferi (Downoi)6–7.5
Hardness
- Amazon Sword3–18 dGH
- Pogostemon Helferi (Downoi)2–15 dGH
Full attributes
Every parameter, side by side| Parameter |  PlantAmazon SwordEchinodorus grisebachii |  PlantPogostemon Helferi (Downoi)Pogostemon helferi |
|---|---|---|
| Category | Plant | Plant |
| Origin | Brazil | Thailand, Myanmar |
| Family | Alismataceae | Lamiaceae |
| Temperature | 22–28 °C | 22–28 °C |
| pH | 6.5–7.5 | 6.0–7.5 |
| Hardness (dGH) | 3–18 | 2–15 |
| Flow rate | Low to Medium | Medium |
| Max height | 40–50 cm | 5–12 cm |
| Difficulty | 2 / 5 | 3 / 5 |
| Light | Low to Medium | Medium to High |
| CO₂ | Optional | Recommended |
| 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 Pogostemon Helferi (Downoi) 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 Pogostemon Helferi (Downoi)?
The Amazon Sword is the easier of the two, closer to beginner-friendly, while the Pogostemon Helferi (Downoi) leans middle-of-the-road.
Do Amazon Sword and Pogostemon Helferi (Downoi) 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 Pogostemon Helferi (Downoi)?
Placement and light. The Amazon Sword works as background, the Pogostemon Helferi (Downoi) as foreground or midground, and their light needs differ, which is covered in the table.