Sand or cleft phlox grows in sandy or rocky areas. The flowers are light blue to white, about 3/4 inch across. It is believed to be extirpated here in Michigan. The last spot I knew of, in Wasahtenaw County, is long gone. There is a population here in Lenawee, long persisting in oak woods on the property of a former rock garden enthusiast. We can probably put that down as a garden escape or, more likely, a persistent planting. But may they live long. They are beautiful little plants not much more than six inches high. Sand phlox grows in AR, IA, IL, IN, KS, KY, MI(X), MO, TN, and WI. Beal Gardens, MSU, 4/12/12.