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Bacopa Monnieri
Bacopa monnieri
Care level: Easy
Known outside the aquarium hobby as Brahmi, a wetland herb used for centuries in Ayurvedic medicine, Bacopa monnieri also thrives fully submerged, producing thick, succulent, rounded leaves along sturdy upright stems. Its tolerance of a wide range of water conditions and brackish water alike has made it a long-standing beginner-friendly background plant.
Weekly 20-30% water changes; very adaptable, pH 6.0-8.0, 22-28°C, soft to hard and even mildly brackish water.
CO2 & Feeding
Grows without CO2 injection but benefits from it with denser, more compact growth; a moderate feeder that appreciates regular liquid fertilizer.
Substrate
Any standard planted substrate works well; roots readily in gravel or aquasoil alike.
Temperature
22-28°C. It tolerates cooler water, but growth slows.
Growth speed
Fast
Tank Placement
Background
Did you know?
The same species grown in aquariums as Bacopa monnieri is sold in health food stores as Brahmi, an herb used in traditional medicine, the plant leads a genuine double life between the fish tank and the herbal supplement aisle.
Care by Season
Spring
Growth resumes steadily; trim tips and replant cuttings to fill in the background.
Summer
Peak growth, trim every couple of weeks to prevent tall, leggy stems from reaching and bending at the surface.
Autumn
Growth slows; reduce trimming frequency as stems lengthen more slowly.
Winter
Tolerates cooler water reasonably well but growth slows considerably.
Growing & Maintenance
Planting
Plant the stems in any standard substrate, gravel or aquasoil, in the background of the tank.
Fertilising
A moderate feeder. Dose liquid fertiliser regularly.
Trimming
Trim every couple of weeks in peak growth, before the stems reach the surface and bend over.
Propagation
Cut the healthy top off a stem and replant it in the substrate.
Pests & Diseases
Common problems
Bare lower stems
Most likely cause: Normal as the stems age and stretch toward the light.
What to do: Cut the healthy top section and replant it.
Yellowing leaves
Most likely cause: Nutrient deficiency.
What to do: Increase the liquid fertiliser dose.
Wide gaps between the leaves
Most likely cause: Too little light.
What to do: Give it moderate aquarium lighting.
Stems bending over at the surface
Most likely cause: No trimming.
What to do: Trim the tops and replant them to fill the background.
Very slow growth
Most likely cause: Cool water.
What to do: Keep the water at 22-28°C.
Pests & Diseases
Bare, leggy lower stems
Signs: Lower portion of stem loses leaves while growth continues only near the tip
Treatment: Cut the healthy top section and replant it directly, discarding the bare lower stem.
Nutrient deficiency (yellowing)
Signs: Older leaves pale or yellow despite adequate light
Treatment: Increase liquid fertilizer dosing, particularly nitrogen and iron.
FAQ
Why are my Bacopa monnieri stems becoming bare at the bottom?
This is normal as the plant ages and stretches toward light; simply cut the top healthy portion and replant it, discarding or composting the bare lower stem.
Can Bacopa monnieri tolerate brackish or hard water?
Yes, it is unusually tolerant of harder, more mineral-rich, even slightly brackish water compared to most soft-water aquarium plants.
Does Bacopa monnieri need CO2?
No. It grows without injected CO2, but grows denser and more compact with it.
How much light does Bacopa monnieri need?
Moderate aquarium lighting. Under lower light the leaves sit further apart on the stem.
What water does Bacopa monnieri need?
It is very adaptable: pH 6.0-8.0, 22-28°C, soft to hard water. Weekly water changes of 20-30% suit it.
How do I propagate Bacopa monnieri?
From cuttings. Cut the top off a stem and push it into the substrate, where it roots.
