Plant comparison
Bacopa Monnieri vs Purple Bacopa
How the Bacopa Monnieri and Purple Bacopa compare on care, size, water and temperament, and which plant suits your tank.
By Mike ElmiraUpdated
TL;DR, Bacopa Monnieri vs Purple Bacopa
The Bacopa Monnieri and the Purple Bacopa are close cousins, both in the Bacopa group, so at a glance they ask for a lot of the same things. 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 Bacopa Monnieri is the more forgiving of the two, which matters if this is an early tank, while the Purple Bacopa 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.
Temperature
- Bacopa Monnieri22–28 °C
- Purple Bacopa22–28 °C
pH
- Bacopa Monnieri6.5–7.5
- Purple Bacopa5.5–7.5
Hardness
- Bacopa Monnieri5–18 dGH
- Purple Bacopa2–12 dGH
Full attributes
Every parameter, side by side| Parameter |  PlantBacopa MonnieriBacopa monnieri |  PlantPurple BacopaBacopa salzmannii |
|---|---|---|
| Category | Plant | Plant |
| Origin | Cosmopolitan tropics (including South African wetlands) | South America |
| Family | Plantaginaceae | Plantaginaceae |
| Temperature | 22–28 °C | 22–28 °C |
| pH | 6.5–7.5 | 5.5–7.5 |
| Hardness (dGH) | 5–18 | 2–12 |
| Flow rate | Low to Medium | Low to Medium |
| Max height | 10–30 cm | 20–35 cm |
| Difficulty | 1 / 5 | 2 / 5 |
| Light | Medium to High | Medium to High |
| CO₂ | Optional | Recommended |
| Growth rate | Slow to Medium | Medium |
Frequently asked questions
Direct answers to the questions search engines and AI assistants surface most often about this species.
Can you keep Bacopa Monnieri and Purple Bacopa 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 Bacopa Monnieri or the Purple Bacopa?
The Bacopa Monnieri is the easier of the two, closer to very easy, while the Purple Bacopa leans beginner-friendly.
Do Bacopa Monnieri and Purple Bacopa 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 Bacopa Monnieri and the Purple Bacopa?
Placement and light. The Bacopa Monnieri works as midground or background, the Purple Bacopa as background or midground, and their light needs differ, which is covered in the table.