A close-up of Ludwigia repens. This is one of my favorites among all fast-growing and less demanding Stem Plants. A native of North America, this plant is one of the most popular aquarium plants through out the world. It can survive with even medium light, but will show it's actual color, bright red, only if it gets high light. Like other stem plants, Ludwigia repens is very effective to fill the mid-ground or background of the tank, if planted in small groups. This plant needs to be pruned regularly and when pruned it develops numerous side branches and becomes bushy.