Ludwigia Repens

Ludwigia repens is one of the easiest red-tinged stem plants you can keep, with olive-green tops and rich red-to-burgundy undersides that deepen as light increases. It's remarkably undemanding — it'll show color even in modest setups without CO2, though both light and CO2 intensify the effect. Plant it in groups through the mid to background for an easy pop of red.

Care level: Easy · Placement: Midground/Background · Lighting: Low-Medium · CO2: Beneficial · Growth rate: Fast · Propagation: cuttings