Bacopa Salzmannii care guide
Bacopa Salzmannii (Bacopa salzmannii) — medium light, 22-28 °C, pH 6-7.5, no CO2.
Compiled by Aquairi from published sources · Published · Updated
Overview
Bacopa Salzmannii (Bacopa salzmannii) is an aquatic plant of the family Plantaginaceae, listed in the Aquairi knowledge base as a beginner-level species. It is typically grown under medium light and without obligatory CO2 injection on any substrate. A beautiful stem plant that develops reddish-purple coloration under good lighting. Compact growth habit makes it versatile for midground or background use in smaller tanks.
Taxonomy
- Family: Plantaginaceae
- Genus: Bacopa
- Scientific name: Bacopa salzmannii
- Common synonyms: Purple Bacopa
Habitat
Bacopa is a pantropical genus of small marsh plants in the family Plantaginaceae; species occur in shallow standing water, wet meadows and stream margins of the Americas and Asia. In the Aquairi knowledge base, populations associated with this form are recorded from South America.
Growth requirements
- Lighting: medium
- CO2: not required
- Temperature: 22-28 °C (72-82 °F)
- pH: 6-7.5
- GH: 3-12 °dGH
- Substrate: any
- Maximum height: 30 cm
- Growth rate: medium
- Recommended placement: midground
Placement
Mid-to-background stem; smaller, slower forms hold compact upright shape that pairs well with feathery neighbours. In the Aquairi knowledge base this form is recommended for the midground under medium light and without obligatory CO2 injection, using any substrate.
Propagation
Cuttings root readily when replanted; periodic trimming maintains a dense cluster. Documented propagation techniques for this entry include: stem cuttings.
Common issues
Older bottom leaves yellow and fall first under shading; restoring direct light and trimming the canopy stops further loss.
Propagating Bacopa salzmannii 'Purple' from Cuttings
Overview
Bacopa salzmannii 'Purple' is a South American stem plant with a medium growth rate that reaches about 30 cm. It is roughly half the size of Bacopa caroliniana and carries vibrant purple and green tones that intensify under medium to high lighting. It suits the midground or background, where it adds depth and colour contrast.
The plant is rated easy and is propagated entirely from stem cuttings, making it a reliable choice for aquascapers who want a colourful purple stem without difficult care.
Propagation Method (Cuttings)
Bacopa salzmannii is multiplied by head cuttings and partial cuttings. After a stem is cut, it produces plenty of side shoots from the remaining base, so a single trimmed plant quickly becomes several.
Step-by-Step
- Cut the top 5-10 cm of a healthy stem with clean scissors, just above a leaf node.
- Strip the lowest pair of leaves so the bare nodes can be buried.
- Plant the cutting a few centimetres into the substrate in the midground or background.
- Leave the trimmed parent in place; its base will send out new side shoots.
- Space several cuttings a short distance apart to form a dense group.
Conditions for Healthy Growth
Bacopa salzmannii needs medium to strong lighting and a complete macro- and micronutrient supply through the water column; a nutrient-rich substrate and CO2 addition are advantageous. Higher PAR (around 100 umol and above) brings out the strongest purple, and even the greener forms turn purple under high light.
Compared with the hardiness-tolerant Bacopa caroliniana, B. salzmannii prefers softer water. CO2 in the medium range (about 6-14 mg/L) and regular fertilization maximise both growth and colour.
Trimming & Maintenance
Because cutting triggers side shoots, regular topping both controls height and thickens the stand. Replant the removed tops to expand the group, and keep light and nutrients steady so new growth holds its purple tone.
Common Challenges
Pale or fully green growth almost always means too little light — raise PAR or move the plant higher in the tank. Brighter lighting can also encourage algae on Bacopa, so balance light with nutrients and CO2 rather than overdriving intensity alone.