Bacopa monnieri is one of the most widely used stem plants in the hobby, and deservedly so — it is genuinely tolerant of a wide range of lighting, temperature, and water conditions that would trouble many other plants. The small, rounded leaves grow on upright stems that can reach 50cm, and in good conditions the plant will occasionally produce delicate white to pale pink flowers above the waterline.Growth can be managed easily by pinching out the top shoots: the plant responds by branching freely, producing a bushy, compact form. It also grows well in the shade of larger plants, making it useful in aquariums where light doesn't reach evenly across the tank. CO2 is not required, though it speeds up growth noticeably.Plant stems in small groups directly into the substrate. Trim regularly to maintain the shape you want and replant the trimmings to fill in gaps in the scape.