Lysimachia nummularia (creeping loosestrife, creeping jenny, moneywort; goes by a few names) is a very fast growing ground cover.  It will thrive in moist areas and in part sun to shade. In drier areas it will need to be watered or it may die out.  In a short amount of time it can create a 2’ dense mat.  It grows close to the ground forming roots at every leaf node all along its stems.  Creeping Jenny is listed on Delaware’s Invasive Plant List because of its rapid growth rate and ability to choke out Delaware’s native habitats.  Lysimachia “aurea” is a slower growing variety, but still very invasive.  It is a pretty ground cover, and still sold in garden centers, but I am hesitant to recommend growing it.  If you do grow it, keep an eye out so it does not escape the area where it is planted.  As it creeps closer to perennials that you want to keep, remove some it.  It looks beautiful in container gardens cascading over the pot.  Again, need to keep a watch on it.  When it flowers, the seeds can spread.  If any plant breaks off, it will form a new mat on the ground.  My recommendation is that it not be used at all.