I need a ground cover for a hot, dry, full sun area. This area gets reflected sun from two white buildings and a cement border so nothing seems to grow back there but weeds. I need a ground cover that is capable of withstanding the heat and sun but that is also attractive. Also, the ideal plant would be fast-spreading, even to the point of being invasive. This is because I want to choke out the weeds. Does such a plant exist?