Bacopa Caroliniana

Native to the southeastern United States, Bacopa caroliniana is one of those plants that just works in almost any low-tech setup. It grows in thick, upright stems with small, rounded, lime-green leaves arranged opposite each other, giving it a very tidy, stacked appearance. Under higher light the leaves can take on a faint bronze or golden tone, which adds some warmth to a background planting.

Growth is genuinely slow compared to most stem plants, which is actually a selling point for beginners who don't want to prune every week. It won't suddenly swamp smaller plants or block light overnight. You can plant it directly in substrate and it'll root without complaint, requiring no CO2 injection or special fertilizers to stay healthy.

A nice quirk is the faint lemony or minty scent it releases when stems are trimmed above the waterline. Works best planted in groups of five or more stems toward the back of the tank where it fills space without dominating. Propagation is simple: cut a stem, replant it, done.

If you browse planted tank journals from people running low-tech or walstad-style tanks, Bacopa caroliniana shows up constantly for a reason.