Some say it is invasive, like the state of CT, but I like vinca minor, periwinkle. HD should sell flats in your area. Plant every twelve inches on center, stagger the rows, with each plant a handful of manure mixed with the existing soil and a dash of bone meal in each hole before planting. Blue flowers in spring, announces its arrival and throughout the summer.

Here is a link that might be useful: Propagating Perennials