Plant comparison
Eriocaulon Cinereum vs Pogostemon Helferi (Downoi)
How the Eriocaulon Cinereum and Pogostemon Helferi (Downoi) compare on care, size, water and temperament, and which plant suits your tank.
By Mike ElmiraUpdated
TL;DR, Eriocaulon Cinereum vs Pogostemon Helferi (Downoi)
The Eriocaulon Cinereum 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 27 °C and pH 6 to 6.8, so a single tank can suit either one. The Pogostemon Helferi (Downoi) is the more forgiving of the two, which matters if this is an early tank, while the Eriocaulon Cinereum rewards a bit more attention. Read the full care notes on each below and pick the one whose look and pace fit the tank you're building.
Group compatibility overview
Excellent fit
Every key parameter overlaps and no major conflicts surfaced.
1 note
Temperature
- Eriocaulon Cinereum22–27 °C
- Pogostemon Helferi (Downoi)22–28 °C
pH
- Eriocaulon Cinereum5–6.8
- Pogostemon Helferi (Downoi)6–7.5
Hardness
- Eriocaulon Cinereum0–6 dGH
- Pogostemon Helferi (Downoi)2–15 dGH
What to plan for
- Demanding species presentEriocaulon Cinereum are difficulty 4+. Stable parameters and weekly maintenance are non-negotiable.
Full attributes
Every parameter, side by side| Parameter |  PlantEriocaulon CinereumEriocaulon cinereum |  PlantPogostemon Helferi (Downoi)Pogostemon helferi |
|---|---|---|
| Category | Plant | Plant |
| Origin | Southeast Asia, India | Thailand, Myanmar |
| Family | Eriocaulaceae | Lamiaceae |
| Temperature | 22–27 °C | 22–28 °C |
| pH | 5.0–6.8 | 6.0–7.5 |
| Hardness (dGH) | 0–6 | 2–15 |
| Flow rate | Low | Medium |
| Max height | 5–10 cm | 5–12 cm |
| Difficulty | 4 / 5 | 3 / 5 |
| Light | High | Medium to High |
| CO₂ | Required | Recommended |
| 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 Eriocaulon Cinereum and Pogostemon Helferi (Downoi) together?
Yes. Their temperature and pH ranges overlap around 22 to 27 °C and pH 6 to 6.8, 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 Eriocaulon Cinereum or the Pogostemon Helferi (Downoi)?
The Pogostemon Helferi (Downoi) is the easier of the two, closer to middle-of-the-road, while the Eriocaulon Cinereum leans demanding.
Do Eriocaulon Cinereum and Pogostemon Helferi (Downoi) need the same water?
Close to it. Aim for 22 to 27 °C and pH 6 to 6.8 and you're in the shared sweet spot for both. Full ranges are in the table above.
What's the main difference between the Eriocaulon Cinereum and the Pogostemon Helferi (Downoi)?
Placement and light. The Eriocaulon Cinereum works as midground, the Pogostemon Helferi (Downoi) as foreground or midground, and their light needs differ, which is covered in the table.