The cedar glades of middle Tennessee comprise a globally rare ecosystem increasingly threatened by human encroachment. These habitats are of special interest to botanists because they contain a large number of endemic plant species, some of which are rare, as well as disjunct populations otherwise restricted to the central United States. While previous work has demonstrated that soil depth is an important determinant of plant community structure, little is known about the spatial arrangement of soils of varying depths and their associated species compositions on glades. One hypothesis is that species richness is positively correlated with soil depth, and that soil depth increases linearly from the centers to the edges of glades. Although species richness was correlated with soil depth, I found no evidence of a center-to-edge gradient in soil depth on any of the study glades. Rather, soil depth and species richness tended to follow a mosaic of patterns that varied widely among the different glades.