A new attractive stems plant is Ludwigia spec. 'Dark Orange'. The species name refers to the coloration of the underwater leaves in the aquarium. Depending on the illuminance, a beautiful coloring from gelborange to deep dark orange appears. A further feature is the conspicuous vorticity of the supernatant leaves, but also in the submerged stage it is still clearly recognizable. Like all stem plants, this color novelty should also be planted in a larger number of stems in order to achieve a good effect. Strong lighting and sufficient CO2 additions are guaranties for a strong growth.